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I have a drawer full of socks.

There are 5 socks of each colour, red and green, evenly mixed. In the morning, when it is very dark, I need to pull out a pair of socks of the same colour.

How many must I pull out of the drawer to ensure that I have at least one pair of matching socks?

 [Ref: ZVFI] © Kevin Stone

Three socks.

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