fx-82MS fx-82TL fx-9860GII TI-83
nCr
On a TI calculator you can calculate combinations
MATH ► ► ► 3
or via the catalog as
CATALOG ⎵ 2nd 0 ►nCr ENTER
The English lettering reads 'from n Choose r'.
Example 1
To calculate
4 MATH ► ► ► 3 4 nCr 2 ENTER 4 nCr2 6
Example 2
To calculate 5 nCr 2 = 10 via the catalog
CATALOG ⎵ 5 2nd 0 ►nCr ENTER 5 nCr 2 ENTER 5 nCr 2 10
Example 3
To calculate
0 MATH ► ► ► 3 0 nCr 0 ENTER 0 nCr 0 1
Example 4
To determine how many different 4-member groups can be organized in a group of 10 individuals
1 0 MATH ► ► ► 3 10 nCr 4 ENTER 10 nCr 4 210