18. Assume that each child who is born is equally likely to be a boy or a...
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18. Assume that each child who is born is equally likely to be a boy or a girl. If a family has two children, what is the probability that both are girls given that (a)
the eldest is a girl,
(b) at least one is a girl?
19. Two dice are rolled. What is the probability that at least one is a six? If the two faces are different, what is the probability that at least one is a six?
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