Can someone help me with this interesting question ? A bowl contains twenty cherries, exactly fifteen of which have had their stones removed. A greedy pig eats five whole cherries, picked at random, without remarking on the presence or absence of stones. Subsequently, a cherry is picked randomly from the remaining fifteen. (a) What is the probability that this chery contains a stone ? (b) Given that this cherry contains a stone, what is the probability that the pig consumed at least one stone ?