**Calculating
a Permuation**

In mathematics, to calculate the permutation of n things taken r at a time, we use the formula. The TI-83/84 has this formula already built in.

To
calculate ,
on the home screen first press the **MATH** key. Next
press the **RIGHT ARROW** key three times so that **PRB **is highlighted. Press **2** to select the permuation formula then type **10**, press** RIGHT ARROW**, then type **7 **and press
**ENTER.** The results are shown below.

Thus, =
**604,800.**

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