Out of the 24 apples in a box, 6 are bad. If three apples are taken from the box at random, with replacement, find the probability that : (a) the first two ...

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Out of the 24 apples in a box, 6 are bad. If three apples are taken from the box at random, with replacement, find the probability that :

(a) the first two are good and the third is bad ;

(b) all three are bad ;

(c) all the three are good.