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Logical Thinking Riddle

Logical Thinking Riddle - 9 April

I have 100 coins in my wallet.

What is the minimum number of coin(s) needed to be placed in a flat floor , to make sure each coin touched exactly three other coins.

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11 comments:

  1. 4

    3 placed flat on the table in a triangle(touching each other) and put the fourth one on top of them in the middle

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  2. If the coins are to be laid flat it is not possible, since no end coin can touch more than 2 coins and any center coin will touch more than 3. If they can be stacked then a triangle of coins with one in the center on top, or 4. The 100 coins is a red herring.

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    Replies
    1. Don't line them up. Take seven coins of the same denomination. Place one in the center and place a ring of six coins around it.

      Each coin will touch three others.

      Delete
    2. But the central coin is touching 6 right?

      Delete
  3. the answer is three hundred

    ReplyDelete
  4. 5 put one coin below

    ReplyDelete