Proposition 351 properties of combinations 1 c n r c

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Proposition 3.5.1. (Properties of combinations) 1. C ( n, r ) = C ( n, n - r ) 2. C ( n, n ) = C ( n, 0) = 1 3. C ( n, 1) = C ( n, n - 1) = n Example 48. Marbles and Poker Hands; Examples 7 and 8 in Section 6.4 of [1]. 17

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