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A bag contains 5 white, 7 red and 8 black balls. If 4 balls are drawn one by one with replacement, what is the probability that all are white ?
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- 1/256
- 1/16
- 4/20
- 4/8
Correct Option: A
Probability that first ball drawn is white = 5C1 = 1/4
Since, balls are drawn with replacement, hence all the four events will have equal probability.
Therefore, required probability = 1/4 x 1/4 x 1/4 x 1/4 = 1/256
