fx-82MS fx-82TL fx-9860GII TI-83
nCr
On a Casio calculator you can calculate a combination
▷ PROB nCr OPTN F6 F3 F3
or via the catalog as
CATALOG P INPUT SHIFT 4 C F1
The English lettering reads 'from n Choose r'.
Example 1
To calculate
▷ PROB nCr 4 OPTN F6 F3 F3 4C 2 EXE 4C2 6
Example 2
To calculate 5C2 = 10 via the catalog
CATALOG P INPUT 5 SHIFT 4 C F1 5C 2 EXE 5C2 10
Example 3
To calculate
▷ PROB nCr 0 OPTN F6 F3 F3 0 EXE 0C0 1
Example 4
To determine how many different 4-member groups can be organized in a group of 10 individuals
▷ PROB nCr 1 0 OPTN F6 F3 F3 4 EXE 10C0 210