Math
posted by Luu Luu .
Sally has seven blue socks and three white socks in a drawer. She picks out two socks without looking. What is the probability that both socks will be blue?

Math 
bobpursley
What is 7/10*6/9 ?

Math 
Jubal
There are choose(10,2) = 45 ways to choose two things from ten if order doesn't matter.
There are choose(7,2) = 21 ways to choose two blue socks.
So 21/45 = 7/15
(This is the same answer as Bob's... do you see why?)
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