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A bookstore has 8 Algebra with Trigonometry books and 7 Introduction to Biology books available. If two customers purchased a book, find the probability that:

A bookstore has 8 Algebra with Trigonometry books and 7 Introduction to Biology books available. If two customers purchased a book, find the probability that:

a) one of each book was purchased b) only Algebra with Trigonometry books were bought c) only Introduction to Biology books were bought

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