Posted by ana on Thursday, April 21, 2011 at 12:59pm.
Ways to get 2 socks out of 18
=(18,2)=18!/(2!(18-2)!)
=153
Ways to get 2 navy socks
=(5,2)
Ways to get 2 white socks
=(7,2)
Ways to get 2 black socks
=(6,2)
So ways to get two different coloured socks
=(153-(5,2)-(6,2)-7,2))
out of a total possible 153 ways.
Calculate the probability.
I get less than 70%.
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