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Quantitative Aptitude :: Probability - Discussion

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A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the probability that none of the balls drawn is blue?





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Answer: 10/21

Solution: 2 red, 3 green, and 2 blue balls are there. So the probability of getting no blue ball is not selecting any blue ball among the two chosen balls hence 5C2.

5C2/7C2 = 10/21.

7C2 because we can select any 2 balls from 7 balls in that number of ways.

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