You can choose 3 books from a list of 5 to read for English class. How many combinations of 3 books are possible?

Holt McDougal Larson Algebra 1 Common Core Edition page ep12 number 10

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You have 5 total books and it doesn't matter how you stack them

5 total events with 3 possibilities because you are taking only 3 books

5C3 = 5C2 = (5*4)/(1*2) = 10 combos of the 3 books