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 10, then press the MATH key. Next
press the RIGHT ARROW key three times so that PRB is highlighted.
Press 2 to select the permuation formula. Next type 7 and press
ENTER. The results are shown below.
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Thus, =
604,800.
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