Your drawer contains 7 red socks and 6 blue socks. It's too dark to see the color of the socks, so you randomly pull two socks from the drawer. What is the probability that both socks are blue?

Answer 1

prob(2 blue) = (6/13)(5/12) = 5/26

A more interesting question would have been:
What is the least number of sox he would have to pull, before he has a matching pair ?