BrainBashers Puzzles

Puzzle IconI have a drawer full of socks.

There are 10 socks of each colour, red, green, 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: ZKCD]


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