Posted by **Luu Luu** on Wednesday, August 8, 2012 at 4:40pm.

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**, Wednesday, August 8, 2012 at 4:52pm
What is 7/10*6/9 ?

- Math -
**Jubal**, Thursday, June 25, 2015 at 8:19pm
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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