The first two might be one of each colour, but the third has to match one of them. It’s always one more than the number of colours.
Most people think it depends on how many socks are in the drawer. It doesn’t.
A drawer is full of red socks and blue socks, all jumbled together. In the dark, how many socks do you have to take out to be sure of a matching pair?
Give me a hintThe hint
Imagine the worst luck you could have.