SOLUTION: A drawer contains 4 red, 5 blue, and 5 white socks. Three socks are removed from the drawer without looking. a.What is the probability that the three socks selected do not contain

That means she got one of each color.
She could have selected the red one any of 4 ways, the blue one any of 5 
ways, and the white one any of 5 ways.  That's 4*5*5 = 100 ways.

That's the numerator of the probability.

The denominator is 14C3 = 364.  So the probability that she did not get
a matching pair is  or about 27.5% of the time.  

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1 - the probability of getting one of each color =  
or about 72.5% of the time. 

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That's a trick question.  The answer is 0, because there are only 3 colors and
it is therefore impossible to get 4 different colors.  :)

Edwin