! is the factorial function, where n! = n*(n-1)! and 0! = 1, n an nonnegative integer. The function also works for arguments that are half an odd integer and greater than -1/2: is defined as and the rest are defined recursively.
3! 6 (‾.5)! 1.772453851 Ans² 3.141592654
The combinatorial interpretation of factorials is the number of ways to arrange n objects in order.
- ERR:DOMAIN for any numbers except the ones mentioned above.