Factorial
01
阶乘, 阶乘
the product of all positive whole numbers from 1 to a given number
例子
In combinatorics, the factorial is used to determine the number of possible permutations of a set.
在组合数学中，阶乘用于确定一个集合的可能排列数。
factorial
01
阶乘, 阶乘的
multiplying a whole number by all the smaller whole numbers down to 1
例子
In probability theory, factorial calculations often appear in permutations and combinations.
在概率论中，阶乘计算经常出现在排列和组合中。
