Question
A box contains 5 white, 6 green, 3 red, and 5 yellow
marbles. If three marbles are chosen randomly, what is the probability that all three selected marbles are green?Solution
Total number of marbles = 5 + 6 + 3 + 5 = 19 Total number of outcomes = C (n, r) = C (19,3)Â = 969 number of favorable outcomes = C (6,3)Â
= 20 ∴ Required probability = 20/969
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