App description

Usage example

Arrange the calculator for P(n,r) Input data: input n = 7; input r = 4

Note

Symbol description: P-permutation number (now textbook A), total number of n-elements, number of r-elements involved in selection,!-factorial,as 5！=5 * 4 * 3 * 2 * 1=120 C-Combination combination P-Permutation array (Now the textbook is A-Arrangement)

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