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RequireSun 2018-12-28 22:33:25 +08:00 committed by Oleksii Trekhleb
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# 阶乘
在数学上, 一个正整数 `n` 的阶乘 (写作 `n!`), 就是所有小于等于 `n` 的正整数的乘积. 比如:
```
5! = 5 * 4 * 3 * 2 * 1 = 120
```
| n | n! |
| ----- | --------------------------: |
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5 040 |
| 8 | 40 320 |
| 9 | 362 880 |
| 10 | 3 628 800 |
| 11 | 39 916 800 |
| 12 | 479 001 600 |
| 13 | 6 227 020 800 |
| 14 | 87 178 291 200 |
| 15 | 1 307 674 368 000 |