You have 12 black socks and 12 white socks in your drawer. What is the minimum number of socks that you have to take out to make sure that you have a matching pair?
You need to take out three socks.
To have a matching pair, you need to take 2 socks that are of the same color. When you take 3 socks, 2 of the socks will be of the same color.