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I have a drawer full of socks. There are 40 socks of each colour, brown and grey, 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: ZMMS] © Kevin Stone

Three socks.

Whichever I pull out first, the second will either match, or I will have one of each, ready for the third sock.

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