Factorial

可用

Returns the factorial n! = Gamma[n+1] for integers and non-integers

形式

Factorial[0] The factorial of 0 is 1 by definition.

Factorial[1] The factorial of 1 is 1.

Factorial[5] The factorial of 5 is 120 (5! = 5 × 4 × 3 × 2 × 1).

Factorial[10] The factorial of 10 is 3628800.

Factorial[3] The factorial of 3 is 6 (3! = 3 × 2 × 1).

Factorial[7] The factorial of 7 is 5040.

Factorial[12] The factorial of 12 is 479001600.

Factorial[2] The factorial of 2 is 2.

Factorial[4] The factorial of 4 is 24 (4! = 4 × 3 × 2 × 1).

验证过的示例Factorial[0] → 1 Factorial[1] → 1 Factorial[5] → 120 Factorial[10] → 3628800 Factorial[3] → 6 Factorial[7] → 5040 Factorial[12] → 479001600 Factorial[2] → 2 Factorial[4] → 24

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主题

Combinatorial Functions - General
Discrete Mathematics - Enumeration-Related Functions »
Functions Used In Statistics - Statistical Distributions»
Gamma Functions And Related Functions - Integer-Oriented Functions
Integer Functions - Combinatorial Functions »
Integer Sequences - Generating Functions

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