# Math

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?

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1. What is 7/10*6/9 ?

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2. 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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