fac
to
rial
复数形式
factorials
1
阶乘, 阶乘
the product of all positive whole numbers from 1 to a given number
- The factorial of 5 is calculated as 5!=5×4×3×2×1=120.
5的阶乘计算为5! = 5×4×3×2×1 = 120。
- 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。
- To solve the problem, you need to find the factorial of 7.
为了解决这个问题，你需要找到7的阶乘。
- The formula for combinations includes the factorial of the number of items.
组合的公式包括项目数的阶乘。
- Factorials are essential in the binomial theorem for expanding expressions.
阶乘在二项式定理中对于展开表达式至关重要。