SOLUTION: Consider a collection of envelopes consisting of two red envelopes three blue envelopes three green envelopes and three yellow envelopes. Is three envelopes are selected at random

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Question 1171444: Consider a collection of envelopes consisting of two red envelopes three blue envelopes three green envelopes and three yellow envelopes. Is three envelopes are selected at random without placement determine the probability that they are all blue.
Answer by greenestamps(13200) About Me  (Show Source):
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By the basic definition of probability,
                    number of ways of choosing 3 of the 3 blue envelopes
  P(three blue) = --------------------------------------------------------
                   total number of ways of choosing 3 of the 11 envelopes

So

P+=+C%283%2C3%29%2FC%2811%2C3%29+=+1%2F165