21. Two identical boxes contain balls. One of the boxes has 7 red balls and 4 blue balls. The other box has 6 red balls and 9 blue balls. A box is chosen at random and two balls are drawn at random from this box, without replacement. (a) What is the probability that both balls are red? (b) What is the probability that the second ball is red, given that the first ball is red? (c) What is the probability that both balls are green?

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