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A jar contains 28 marbles. It has 10 red, 8 black and 10 green marbles. Two marbles are drawn, the first is not returned before the second one is drawn. What is the probability that both marbles are green?
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A jar contains 28 marbles. It has 10 red, 8 black and 10 green marbles. Two marbles are drawn, the first is not returned before the second one is drawn. What is the probability that both marbles are green?

User Todd Li
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1 Answer

3 votes
P(green) first drawn:
10/28=5/14
P(green) second drawn:
9/27=1/3
As a result, probability that both marbles are green is 5/42. Hope it help!
User Khusamov Sukhrob
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8.7k points
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