TI-BASIC:Factorial
From Learn @ Cemetech
Jump to navigationJump to search
Command Summary
Calculates the factorial of a number or list.
Command Syntax
value!
Menu Location
Press:
- MATH to access the Math menu.
- LEFT to access the PRB submenu.
- 4 to select !, or use arrows.
TI-83/84/+/SE
1 byte
! 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: <math>(-\frac1{2})!</math> is defined as <math>\sqrt{\pi}</math> 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.
Error Conditions
- ERR:DOMAIN for any numbers except the ones mentioned above.
