combinatorics
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CombinatoricsMath/Probability 2019. 10. 14. 11:03
1. Overview 2. Description 2.1 Permutation The number of different possible ways we can arrange a set of elements The order is crucial You always arrange the entire set of elements in the sample space $$P_{n}=n\times (n-1)\times (n-2)\times \cdots \times 1=n!$$ 2.2 Factorial $$n!=1\times 2\times 3\times \cdots \times n$$ The product of the natural numbers from 1 to n 2.2.1 Properties Negative nu..