Mathematical Riddle

Mathematical Riddle - 26 January

Using only two 2's and any combination of mathematical signs, symbols and functions can you make 5?

For Solution : Click Here


197 comments:

  1. Replies
    1. thats 4 2's retard look at my answer from june 6 2012 for right answer

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    2. ur mean!! you cant talk to people like that!!!

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    3. and its 2+2+2+2+2/2=5

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    4. He the mean anoymous person u can only use 2 2's

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    5. There's actuaaly a really simple way of doing it. 2 SQUARED = 4, HALF OF 2 IS 1, 4 + 1 = 5
      sEE? sIMPLE!!!

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    6. lolololololololololololol

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    7. hey two above me...that would still take 4 2's 2(2)+2/2=5

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    8. Omg you lot are over thinking this EASY riddle! 2+2+1=5

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    9. yuo cant use 1 only 2's

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    10. no .... u can use any thing:):

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    11. cause it said U CAN ONLY USE TWO 2SAND ANY MATIMATICAL SIGN FUNCTION OR SYMBOL

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    12. the answer cud be 2+2+6-5 too

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    13. Sqrt(.2^ -2) = 5

      Holly :P

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    14. PEMDAS. Division First.

      2+2+2/2=5

      So its

      2+2+(2/2)=5

      2+2+1=5

      Smart one @First comment

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    15. rely this is easy 2+2+2+2+2/2=5

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    16. Your are incorrect because you do divison first
      so it is (2+2+2+2+2)/2=5

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    17. 2 divided by 2= 1

      2x2=4

      4+1=5

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    18. im in fifth grade and this is easy...



      (2+2+2+2+2)/2

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    19. The answer is 2+2+1 = 5 it says only using two 2's which I have, doesn't say i can't use any other numbers. They guy up from here who put this is right

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    20. 2+2+?=5 2 plus 2 plus what gives you 5?

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    21. actually reading your argument there are several ways to get five with just two and any combination of mathematical terms, for example: 2+2+2+2+2/2=5, also: 2/2+2+2=5,
      and: (2+2+2)/2+2=5, so actually you were both correct.

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    22. You are all over thinking this! it states 'you can only use two 2's'
      2+2 (both 2's used) = 4.
      Now that you have used both two's you simply go plus 1.
      2+2+1=5.
      in that equation, only two 2's are used.

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    23. 2÷2+2+2=5 duh!

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    24. 2+2+2/2=3 not 5

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    25. 2+2x2+2=10 divided by 2 = 5

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    26. No 2+2+2/2=5 cause you fallow pemdas so 2/2=1 so it would be 2+2+1=5

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    27. It's 2+2+2/2=5 because of PEMDAS. So first you do 2/2=1 because division comes before addition in PEMDAS. So now you technically have 2+2+1 which is 5.

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    28. This Is actually easy.... The answer is sqrt(2^-2

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  2. Replies
    1. remember that time when the question said USE TWO 2s

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    2. Thats three twos, squared doesnt count as a 2 because its a mathmatical function

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    3. the correct answer is:
      NO!
      the question is if you CAN make it but you cant!
      everyone is over thinking it you have to really read it carefully!

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    4. Actually you can. It's quite simple, really. Written out the answer is as follows: SQRT (.2 ^ -2)=5

      In simple terms you take .2 to the power of -2 which equals 25 then your answer is the square root of that which is 5

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  3. 2*2 + log(e) = 5; where e is eulers number.
    log(e)/.2 = 5;

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  4. 2^2 + 2/2 = 5

    Andy

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    Replies
    1. four 2's so you're wrong and you just copied someone else..

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    2. your being really mean...please dont talk to people like that.thank you.

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    3. This comment has been removed by a blog administrator.

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    4. the answer is 2/2+4=5

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  5. 2^2 + 2/2 = 5

    Andy

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    Replies
    1. .2 just means 0.2, it isn't actually a function rather a short way of righting/typing 0.2. I don't know why the answer says to be honest...

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    2. *writing. My bad :p

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  6. (2+2+2+2+2)/2 = 5

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  7. {[(2+2)*2]+2}/2 = 5

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  8. Replies
    1. infinity is not a "mathematical" sign, function, or symbol...

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    2. the infinity SIGN is!:):

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    3. And &/& is not always 1! can be 0, 1, or & or whatever you want ... even undefined!

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    4. anything divided by itself does equal one so a correct answer could be 2+2+X/X=5

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  9. Square root ((.2)^(-2))

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    Replies
    1. No...he got it right.

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    2. no he didnt got it it 25 still not 5 :P

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    3. .2 is just short for 0.2

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    4. Actually Nadir Usaf he is indeed correct. He put Square Root in his equation so his answer is actually the square root of 25 which is indeed 5 last I checked

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  10. sq.root of(2+2)! , using the greatest integer function
    where ! means factorial

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  11. only 2 answers correct..which part of only two 2's do people not understand?

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  12. @admin
    is my answer correct???

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  13. The correct ans shud b yes bcoz de hv asked 2hether. Can make it nor ot

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  14. 2+2+2+2+2/2=5

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  15. u guys make it so complicated just do
    (2/2)+2+2=5

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    Replies
    1. you can only use "two 2's" moron

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    2. Yo dude chill with the insults seriously.

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    3. ya what he said!!! if you dont like what people are saying either tell them politely or just get off.

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    4. This comment has been removed by a blog administrator.

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  16. Replies
    1. its NOT the answer.. its been posted 10 times.. and you're stupid

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    2. dude you really gotta take a chill pill

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  17. (2+2) + "the minus sign - turned vertical to make it a one...

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    Replies
    1. & this guy is a non-certified genius!!!

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    2. thats not nice... i dont know what your problems are but dont take it out on these innocent people!

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  18. 2.5+2.5 OR 2.5X2

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  19. 2+2+1=5
    after all you said use only 2 two's , you didnt say dont use other numbers
    :0
    p.s. and Anonymous insulting freak stop being mean to people , come on lets see if u know the answer , go on tell us the answer , if ur the smart guy around here!!!!!!!!!!!!

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    Replies
    1. ONLY TWO 2's are given.

      please stop getting imaginary numbers from your mind to get the answer 5...

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  20. i think (.2 ^ -2)

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    Replies
    1. no thats incorrect, but...... HEY!! if you
      take the square root of (.2 ^ -2) = 5 !!!!!!!!
      GOOD JOB DUDE!!!!

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  21. (2+2+2+2+2)/2=5
    how can you get it wrong!

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    Replies
    1. I thought you were only aloud to use two 2's though... I'm a little confused ._.

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  22. using c/c++ operator it should be..

    ++(2+2)
    or (2+2)++

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  23. hey dude i dont no the correct ans so plzzz say me the ans................... :D

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    Replies
    1. SQRT(.2 ^ -2)
      Take .2 and raise it to the power of -2 and then take the square root.

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    2. SQUARE ROOT!!!!!

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    3. The dot in .2 isn't a function, its just short for writing/typing 0.2

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  24. This is my way, which is quite easy actually. 2 squared is 4, half of 2 is 1, 4 add 1 = 5. See????

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  25. ceiling(sqrt(22)) = 5

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  26. Wow how are people missing (2*2)+ (2/2) = 5

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  27. .... its clearly 2^2+1...

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  28. There are many combinations using multiple numbers (2^2 + (2/2) using 3 or 4 numbers, depending on how you're counting them). I can only think of 2 + 2 = 4 having 5 symbols.

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  29. actually many people are confused here regarding the no. of 2
    we can only use the numeral 2 twice .......
    my answer is square root of 22 and then placing the value in least integer function
    maths guys know what least integer function is and for other people plz google the term for clarity!!
    and in the question it is given that we can use functions too!!
    and feel free to correct me if i am wrong!!! :-)

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    Replies
    1. solution :
      SQRT(.2 ^ -2)
      Take .2 and raise it to the power of -2 and then take the square root.

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    2. hey fool thats .2 not 2....

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    3. And a '.' is a Mathematical symbol. YOU fool. read the question bell-end

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    4. A . isn't a function, it just means its 0.2 not 2.....

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  30. easy its 2+2+?=5 make it an equation...

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    Replies
    1. you're gonna PROVE that two 2's become 5.

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  31. Replies
    1. 2+2+n^(n-n) = 2+2+N^0 = 2+2+1 = 5 .. because any no. that has exponent is 0 is equal to 1 :)

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    2. rodolf rimando .. :)

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    3. no you can't. 0 is not given.

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  32. This comment has been removed by the author.

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  33. (2+2+2)/2 + 2 = 5

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  34. Easy 2•2+2-2/2.
    Clearer: 2 x 2 equals four
    4+2 equals six
    2/2 equals one
    6-1 equals 5!

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  35. 2•2+x, invisible one but it might also get you 4x.

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  36. ok here it goes:

    a, (((2*2)+2)/2)+2=5
    b, ((2+2+2)/2)+2=5
    c, (2+2+2+2+2)/2=5 the most direct

    multiply by an odd number to get an od result.

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  37. Its not hard it took me 2 minutes
    square root(0.2^-2)

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  38. 2 Squared + 2x.5=5

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  39. I wonder y people are saying 4 2's and such. Not many ppl figured it out "_

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  40. How do you do it?!?!?

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  41. int(tan(2)/cos(2))

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  42. 2!+2=5 !=factorial
    1+2+2=5
    2factorial+2
    factorial means to add every number to the number you factorise e.g. 2!=1+2

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    Replies
    1. sorry but factorial is means to multiple all the numbers up to that number. for example: 5!=5*4*3*2*1=120 and 2!=1

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  43. A complex way could be -

    |[-(e^2 - 2)]|

    where [] represents greatest integer function.
    and | | means modulus.

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  44. 0. there r 0 ways.

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    Replies
    1. i meant zero.
      or one. it doesnt ask what.

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    2. 2squared plus the square root of 2

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  45. 2 square x 2 + 2 / 2 = 5

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  46. I think my answer is more creative. it is: 2^2-e^(i*pi)=5

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    Replies
    1. I think your answer is the only correct one lol, because .2 is just short-hand for 0.2, which isn't technically the no. 2
      So hats off to you :)

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  47. Sqrt(.2^ -2) =5

    Holly :P

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  48. Sqrt(.2^ -2) =5

    Holly :P

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  49. i believe you said use only two 2's and blar.. blar.. blar... mathematical symbols. Now I am probably incorrect but is a symbol another word for a number. Probably not but worth a try.

    So 2+2+1= 5.

    Do not have a go at me if I am wrong after all I am only 12

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  50. The answer to this riddle "yes". Is does not ask you "how many 2's" or to write it out. It's a simple "yes" or "no".

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    Replies
    1. And yes I realise that this is not the author's answer. The author did not ask the question correctly.

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  51. This is mostlikely cheating but meh...

    2X=2
    X+X+X+X+X=?

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  52. 2.2x2.2=4.84 which would be rounded up to 5

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  53. what about int(sqrt((2+2)!))) ?
    where int means "nearest integer" or "round" and can be replaced by symbols which I'm too lazy to type (and qsrt means, of course, square root, same story for symbol!)

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  54. 2+2+1 is one of the many correct answers because it says that you can use two two's not "you can't use one"

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    Replies
    1. You can ONLY use two twos....

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  55. 22-2=20/2=10/2=5 thats the ans needed

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  56. Only ONE person before me put this, so (2^2)+(2^0) = 5
    Also, (2+2)+(pi/pi)=5 & (2^2)+(pi/pi)=5
    OR, (2+2)+(x/x)=5... where x is any REAL integer other than 0.
    Also using ONLY ONE #2, Inverse of .2 -> .2^-1=5
    Using NO 2s... (pi/pi)+(pi/pi)+(pi/pi)+(pi/pi)+(pi/pi)=5
    IF you will stand by the nonsense of 'Oh but "^2" (squaring) is considered a 2!!' Then you're better off mentioning that there's a 0 in "^0". Also realize that taking the sqrt of something 'simply means' to take it to the power of .5 ( sqrt(2) = 2^(1/2) = 2^.5 ) and that 'multiplication' is 'simply' short for adding a number to itself an x amount of times (1*3 = 1+1+1).
    If you're not math savvy, then stay literal with 'It's a yes or no question to see if YOU have an answer' and just say NO. Too many wannabe smart-asses thinking they're being clever when they just don't understand basic and simple math concepts.
    INVERSE, SQUARING, SQRT, & EXPONENTIALS ARE FUNCTIONS!
    DECIMALS AND PI ARE SYMBOLS! So all of these OBVIOUSLY fall within the confines of this riddle.

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  57. its so easy guys.... you guys are dorks. its obviously 2+c over w = m+2 over q -himps =5,,, jk 2+2+?=5 is it that hard?

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  58. It's possible to do it like this:

    (((π + π + π + π + π)x2)/π)/2

    = 5

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  59. 2 to the 5th power divide by 2

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  60. what about 2.5+2.5=5

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  61. log to the base of pi of pi(=1) + 2 + 2

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  62. you guys r pathetic it's 2 squared DUHHHHH plus half of 2

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  63. You are all over thinking this! it states 'you can only use two 2's'
    2+2 (both 2's used) = 4.
    Now that you have used both two's you simply go plus 1.
    2+2+1=5.
    in that equation, only two 2's are used.

    Also - it really bothers me that there are so many people that commented say 'this is easy' then they say '2+2+2+2+2/2' because NO THAT IS USING 6 2's NOT 2!
    Ok, i'm done now :)

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  64. Wow, so many wrong answers and not reading the question properly.
    It clearly state: "Using only two 2's" So not three 2's, just 2.
    And yes, squared does count as a 2.
    So here you are Squareroot(0.2^-2)
    = Squareroot(1/0.04)
    = Squareroot(25)
    = 5.
    - And good day to you!

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  65. People are putting
    2+2+2+2+2/2=5, but isn't
    2+2*2+2/2=5 less moves? :)

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  66. Almost all of you use .2 as 0,2, which is not the same, or e or pi as a symbol and not a number. My answer is for example lim n-> 2 of (n+n+n+n+n)/2 = 5 or with Latex \lim_{n \to 2} (n+n+n+n+n)/2 = 5

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  67. SQRT(.2 ^ -2), Duh

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  68. its (2+2+2+2+2)/2

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  69. it is 0.2 / 0.2^2 (square sign isn't a 2)

    = 0.2 / 0.04 = 5

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  70. 2+2!=5
    (2!=3)
    (2!=1+2)
    (n!=1+2+3+4+5+.....+n)
    so simple

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  71. 2cubed - the sqaure root of 2

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  72. square root(0.2^-2)
    It said any combination of mathematical signs, symbols and functions so .2 and -2 can be used

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  73. 2^(2-2)+2^(2-2)+2^(2-2)+2^(2-2)+2^(2-2)

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  74. (2/2)+2+2=5
    explanation:
    2/2=1 and 2+2=4 and 4+1=5

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  75. 2+2+2+2+2=10 then divide 10 by 2 and get 5. I AM ONLY 12 PEOPLE!!!!!!!!!!!!!!!!!!!

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  76. 1/sqrt(2%2) =5
    2%2 meaning 2 percent of 2.

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  77. I don't really like using .2 for 0.2, so here is an another solution:
    ⌈√(2²!)⌉

    (Explanation: 2² is 4. The factorial of 4 is 24 (4·3·2·1). The squareroot of that is a little less than five and the ceiling function changes this number to the next integer, which is 5)

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  78. (2^2)++ = 5
    ++ moves the number to the next integer. Computer Programing.

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  79. SQRT kang (0.2 ^ -2) po

    -bam

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  80. 2+2+x=5 in math a variable with no number ex.5x automaticaly equals one so 2+2+x=5

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  81. =.2*.2
    =(2/10)*(2/10)
    =(1/5)*(1/5)
    =(1/25)^-1
    =sqrt(25)
    =5

    is this one fine???????????????

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  82. nope it's like this
    a=2 ,b=2

    a+b+b/(a/a)=5

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    Replies
    1. no should be minus
      like this
      a+b+b - (a/a)

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