Question: A bag contains 13 blue balls and 7 red balls. If 2 balls are drawn at random from the bag, with the first ball being

A bag contains 13 blue balls and 7 red balls. If 2 balls are drawn at random from the bag, with the first ball being replaced before the second ball is drawn, what is the probability that
(a) The first ball is red and the second is blue?
(b) One ball is red and the other is blue?
Use probability trees to find the probabilities of the indicated outcomes.

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