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a clinical cohort consists of seven sets of girl/boy twins (i.e. each twin pair has a brother and a sister). five of the fourteen subjects

a clinical cohort consists of seven sets of girl/boy twins (i.e. each twin pair has a brother and a sister). five of the fourteen subjects are randomly selected. (a) what is the probability that the selected group is neither all- male nor all-female? (b) what is the probability that the selected group contains no siblings?

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