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kpit cummins Aptitude Interview Logic Question

Interview Cartoonkpit cummins Aptitude Interview Logic Question - 22 March

Product of three consecutive numbers are 7980.

Then the sum of these consecutive numbers would be ?


For Solution : Click Here

17 comments:

  1. Logic:
    19, 20, 21

    Let's represent the 7980 as a product of prime numbers:
    7980 = 19*7*3*2*2*5, as 19 is a largest prime number here, and closest number of 19 which ends with 0 or 5 is 20 => required numbers are 19, 20, 21

    ReplyDelete
  2. 19*20*21=7980
    19+20+21=60

    ReplyDelete
  3. x(x+1)(x+2)=7980
    =>x3+3x2+2x-7980=0
    =>(x-19)(x2+22x+420)=0
    x cant -ve so x=19 other no is 20 &21
    sum=19+20+21=60

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    Replies
    1. Probably you are the only one who did this algebra :-D
      Thnxx !!

      Delete
  4. 60
    Nos are - 19 20 and 21

    Is there any shortcut method to solve this?

    ReplyDelete
  5. take numbers as x-1, x and x+1, product is x^3-x. nearest cube to 7980 is 8000 which is 20^3 and 7980=8000-20. sum is 3x = 60

    ReplyDelete