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From this collection of books, Diane will choose without looking three hardcover detective novels to read during a school break. How many combinations of the three books are possible? Explain


Number of combinations: ?



 May 3, 2018

I'm assuming that the books are arranged on separate shelves, so that Diane knows exactly what books she is choosing. If that is correct, then she can choose in: 12C3 = 220 different ways of choosing 3 hardcover detective novels.

 May 3, 2018

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