# Knowledge Base

## Solution 12303: Calculating Combinations and Permutations on the TI-36X Solar and TI-36X II.

### How do I calculate combinations and permutations on the TI-36X Solar and TI-36X II?

The examples below will demonstrate how to calculate combinations and permutations on the TI-36X Solar.

Example 1 : What are the combinations of 5 choosing 2?

1) Press  [x<>y]  [3rd] [nCr]

The displayed answer will show 10.

Example 2 : What are the permutations of 5 choosing 2?

1) Press  [x<>y]  [2nd] [nPr]

The displayed answer will show 20.

The examples below will demonstrate how to calculate combinations and permutations on the TI-36X II.

Example 1 : What are the combinations of 5 choosing 2?

1) Press  [2nd] [PRB].
2) Arrow over to nCr and press [ENTER].
3) Press  [ENTER].

The displayed answer will show 10.

Example 2 : What are the permutations of 5 choosing 2?

1) Press  [2nd] [PRB].
2) Press [ENTER].
3) Press  [ENTER].

The displayed answer will show 20.

Please see the TI-36X Solar and TI-36X II guidebooks for additional information.