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How Many Different Ways Can An Instructor Select 2 Textbooks From A Possible 17?

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    The first one can be selected 17 ways; the second one 16 ways, for a total of 17*16 = 272. However, each of the selections appears twice in the list if you count (Book 1, Book 2) as being the same selection as (Book 2, Book 1). Thus, the number of different selections is 272/2 = 136.
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    Oddman 

    answered 8 months ago

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