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A choir has seven sopranos, six altos, three tenors, and four basses. The sopranos and altos...

A choir has seven sopranos, six altos, three tenors, and four basses. The sopranos and altos are women and the tenors and basses are men. At a particular rehearsal, three members are chosen at random to make the tea.

a) Find the probability that exactly one bass is chosen,

b) Find the conditional probability that two women are chosen, given that exactly one bass is chosen.

c) Find the probability that the chosen group contains exactly one tenor or exactly one bass (or both).

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