SOLUTION: Two marbles are drawn from a bag containing 6 white, 4 red, and 6 green marbles. Find the probability of both marbles being white. =O I totally dont get how I should find that out

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Question 209319: Two marbles are drawn from a bag containing 6 white, 4 red, and 6 green marbles. Find the probability of both marbles being white.
=O I totally dont get how I should find that out, could anyone show me how to solve this problem??
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
number of ways to draw 2 marbles from 16 ___ 16C2 ___ (16*17) / (2*1) ___ 136

number of ways to draw 2 white from 6 white ___ 6C2 ___ (6*5) / (2*1) ___ 15

probability of both marbles white ___ 15/136