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.
|
|
|
