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Tuesday, August 19, 2014

This Is a Puzzle You've Hated (or Loved) Before


A puzzle re-run today....
Two years ago I ran the below mind-numbing, self-referential puzzle that became one of the most frequent links back to this blog... I think primarily from computer programmers who enjoyed writing code to solve it. Anyway, if you missed it first go-around, here's another chance (answer posted further down):

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Given the following list of 12 statements which of the statements are true?

1.   This is a numbered list of twelve statements.
2.   Exactly 3 of the last 6 statements are true.
3.   Exactly 2 of the even-numbered statements are true.
4.   If statement 5 is true, then statements 6 and 7 are both true.
5.   The 3 preceding statements are all false.
6.   Exactly 4 of the odd-numbered statements are true.
7.   Either statement 2 or 3 is true, but not both.
8.   If statement 7 is true, then 5 and 6 are both true.
9.   Exactly 3 of the first 6 statements are true.
10.  The next two statements are both true.
11.  Exactly 1 of statements 7, 8 and 9 are true.
12.  Exactly 4 of the preceding statements are true.

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answer:  1, 3, 4, 6, 7, 11 are true

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