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22.1: Motivation
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How many different four-member study groups could be formed from a class of twenty students?
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22.2: Basics
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Combination: a finite subset of a given set
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22.3: Applications
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How many ways are there to distribute seven coins amongst three children? (Assume the coins are indistinguishable. But children are obviously distinguishable.)
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22.4: Properties
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Note: In this section we will use the alternative notation Cnk in place of C(n,k).
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22.5: Activities
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22.6: Exercises
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