Bite-sized brain teaser to solve in a minute or less.

The Mismatched Socks
Category: Logic, Probability
You have a drawer with 10 black socks, 10 white socks, and 10 gray socks, all mixed up. The room is dark, and you can’t tell the colors apart by touch.
What is the minimum number of socks you must pull out to guarantee you have at least one matching pair?
Solution
To guarantee a matching pair, you only need to pull out 4 socks.
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