50 MATHCOUNTS LECTURES (24) COMBINATOTICS BASIC …

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50 mathcounts lectures (24) COMBINATOTICS 52 BASIC knowledge 1. Terms A permutation is an arrangement or a listing of things in which order is important. A combination is an arrangement or a listing of things in which order is not important 2. Definition The symbol ! (factorial) is defined as follows: 0! = 1, and for integers n 1, n!= n (n 1) 1. 1! = 1, 2! = 2 1=2, 3! = 3 2 1=6, 4! = 4 3 2 1 = 24, 5! = 5 4 3 1 1 = 120, 6! = 6 5 4 3 2 1 = 720.

50 MATHCOUNTS LECTURES (24) COMBINATOTICS 52 BASIC KNOWLEDGE 1. Terms A permutation is an arrangement or a listing of things in which order is important.

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