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- A bag contains 12 white and 18 black balls.
Question 1:
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?
A. 18/145
B. 18/29
C. 36/135
D. 36/145
Feedback The probability that first ball is white:
=12C1/30C1
=1230
=25
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,
=(25)×(18/29)
=36/145
=12C1/30C1
=1230
=25
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,
=(25)×(18/29)
=36/145
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