Answer :

(i) Balls are drawn at random,

So, the probability that none is white is,

In a trial the probability of selecting a non-white ball is

So, in 4 trials it will be,

⇒ ()()()()=

(ii) Balls are drawn at random,

So, the probability that all are white is,

In a trial the probability of selecting a white ball is

So, in 4 trials it will be,

⇒ ()()()()=

(iii) 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

So, in 4 trials the probability that at least one is white is,

Selecting a white and then choosing from the rest,

⇒ 1- that no ball is white

is .

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