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there are 3 white balls, so there is only one way to select the 3 BUT
___ they are selected along with one blue ball, which can be done in 5 different ways
___ so there are 5 ways to select 3 white balls (and one blue one)
there are 3C2 ways to select 2 white balls, and 5C2 ways to select the 2 blue ones to go with them
___ so there are [(3C2)(5C2)] or 30 ways of selecting 2 white balls
probability of 2 OR 3 white ___ (5 + 30) / 70