A bag contains 20 balls numbered from 1 to 20. One ball is drawn at ra – InterviewSolution

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1.

A bag contains 20 balls numbered from 1 to 20. One ball is drawn at random from the bag. What is the probability that the ball drawn is marked with a number which is multiple of 3 or 4?

Answer»

Number of balls = 20

∴ n(S) = 20

Number of balls marked with multiple of 3 or 4 is 3,6,9,12,15,18,4,8,16,20

∴ n(A) = 10

The required probability P(A) = n(A)/n(S) = 10/20 = 1/2

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