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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