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Rate A Puzzle

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?

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[Ref: ZMMS] © Kevin Stone

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