SOLUTION: 3 red envelopes, 2 blue envelopes, 1 green envelope, and 3 yellow envelopes. Three envelopes are selected at random, without replacement, determine the probability that they are al

Algebra ->  Probability-and-statistics -> SOLUTION: 3 red envelopes, 2 blue envelopes, 1 green envelope, and 3 yellow envelopes. Three envelopes are selected at random, without replacement, determine the probability that they are al      Log On


   

Question 1129924: 3 red envelopes, 2 blue envelopes, 1 green envelope, and 3 yellow envelopes. Three envelopes are selected at random, without replacement, determine the probability that they are all yellow envelopes
Answer by Boreal(15235) About Me  (Show Source):
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9 envelopes, 3 are yellow
(3/9) probability first is then (2/8) and (1/7)
This is (1/3)(1/4)(1/7)=1/84