Thursday, April 10, 2008

Calculators Down, Please

Without using a pencil or calculator, solve this puzzle:

1 3 1 = 1
11 3 11 = 121
111 3 111 = 12,321
1,111 3 1,111 = ?

4 comments:

  1. 1,1111 3 1,1111

    ReplyDelete
  2. It works like this
    1 * 1 = 1
    11 * 11 = 121
    111 * 111 = 12321
    1111 * 1111 = 1234321

    so the ans is 1234321

    ReplyDelete
  3. You guys are good! 1,234,321 is the answer.

    ReplyDelete
  4. Even easier... start at 1 and count down and back up one line at a time. Ignore everthing outside of the ( ).

    (1) 3 1 = 1
    (11) 3 11 = 121
    (111) 3 111 = 12321
    (1111) 3 1111 = 1234321

    (1) \ 1 down to 11(2), up to 1
    (11) / 1 2 1

    etc

    ReplyDelete

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