# How do you calculate combinations on the TI-84?

##### 1 Answer

I use a

The procedure is called

From a group of

Say you want to choose 3 students as class-representatives from a class of 25:

**Recipe**

Type in

Use the

Choose

Type in

The answer (

**BTW:**

If the order *is* important (1st=president, 2nd=secretary, 3d=member), then you use

The ratio between the two is the number of different orders that this selection can be in. (in this case

In other words:

Where