Posted by makeeda on Friday, January 29, 2010 at 9:16am.
Do you pick two? If you are trying for a matched pair, why would you replace the first one?
There are a total of 20 socks. You can either pick white and then white, or blue and then blue. Add the two probabilities.
(8/20)^2 + (4/20)^2
= (2/5)^2 + (1/5)^2
= 5/25 = 1/5
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