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Home » A bag contains 5 white, 7 red 8 black balls. If four balls are drawn one by one with replacement, what is the probability that At least one is white
A bag contains 5 white, 7 red 8 black balls. If four balls are drawn one by one with replacement, what is the probability that At least one is white
Binomial Distribution | CBSE | Class 12 | Exercise 32A | Maths | RS Aggarwal
A bag contains 5 white, 7 red 8 black balls. If four balls are drawn one by one with replacement, what is the probability that At least one is white

Balls are drawn at random,
So, the probability that at least one is white is,
In a trial the probability of selecting a white ball is \frac{5}{20}
So, in 4 trials the probability that at least one is white is, Selecting a white and then choosing from the rest, \Rightarrow 1-\frac{81}{256} that no ball is white is \frac{175}{256}.

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