fx-82MS fx-82TL fx-9860GII TI-83
nPr
On a Casio calculator you can calculate permutations
MATH ► ► ► 2
or via the catalog as
CATALOG ⎵ 2nd 0 ►nPr ENTER
The description stands for 'n Permutation r'.
Example 1
To determine how many 4-digit values can be produced using the numbers 1 through 7. Numbers can not be duplicated within the same 4-digit value (1234 is allowed, but 1123 is not)
7 MATH ► ► ► 2 7 nPr 4 ENTER 7 nPr4 840