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Wednesday, November 10, 2010

Sock Search

Puzzle.
     
In your bedroom you have a drawer with 2 red, 4 yellow, 6 purple, 8 brown, 10 white, 12 green, 14 black, 16 blue, 18 grey, and 20 orange socks. It is dark in your bedroom, so you can't distinguish between the colors of the socks. 
How many socks do you need to take out of the drawer to be sure that you have at least three pairs of socks of the same color?

Solution.

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