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You have exactly 10 pairs of blue socks and 10 pairs of red socks all kept in one drawer.
The power is out and you need to urgently go out.
How many socks must you grab to ensure that you have a pair that match when you get to your car.
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if you grab 3 socks. 2 of them will be either red or blue.
So the answer is 3 socks.