Socks
Inside the drawer of a dressing-table in a dark room, there are 28 black socks and 28 brown socks. What is the minimum number of socks that I must take out of the drawer to guarantee that I have a matching pair?
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Three. If I pick three socks, then either they are all of the same colors [in which case I certainly have a pair of the same color] or else two are of one color and the third is of the other color, so in that case, I would again have a matching pair.
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