fac·to·ri·al
noun/fækˈtɔːriəl/
/fækˈtɔːriəl/
(mathematics)- the result when you multiply a whole number by all the numbers below it
阶乘 - 5! (= factorial 5) is 120 (= 5 × 4 × 3 × 2 × 1).
5!（5 的阶乘）为 120（即 5 × 4 × 3 × 2 × 1）。
- 5! (= factorial 5) is 120 (= 5 × 4 × 3 × 2 × 1).