A bag contains 12 white and 18 black balls Two balls are drawn in succession without replacement Wha...........

Quantitative Aptitude ( CCS) Probability

A bag contains 12 white and 18 black balls. Two balls are drawn in succession without replacement. What is the probability that first is white and second is black?

36/135

36/145

18/ 91

30/91

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Explanation:

he probability that first ball is white= 12c1/30c1= 2/5
Since, the ball is not replaced; hence the number of balls left in bag is 29.
Hence the probability the second ball is black= 18c1/29c1 =18/29
Required probability = 2/5*18/29 = 36/145

Hence, otpion 2 is the correct answer.