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**Problem : **

You have 12 black socks and 12 white
socks mixed up in a drawer. It's early in the morning and you don't have any
light to see the colors. How many socks must you pull out (blindly) to be sure
of getting a matching pair?

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**Solution ****:**

3 socks. If the first sock is black, the second one could be black, in
which case you have a matching pair. If the second sock is white, the third
sock will be either black and match the first sock, or white and match the
second sock.

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