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Tuesday, February 23, 2010

Don McCarthy's Questions of the Week

Puzzle #1: Imagine you are sitting in a dark room, where you are handed a deck of 52 cards. Ten of those cards have been turned facing up; the rest are facing down. Your job is to separate the cards into two stacks, each containing the same number of cards facing up. Is it possible to do this?

Puzzle #2:

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