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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