2.3. Permutation Problems http://www.ck12.org
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Answer:
First, lets compute 18 P 18 with the factorial function. Remember, the formula to solve permutations like these is:
nPr=n!
(n−r)!This means that 18 P 18 can be written as follows:
18 P 18 =
18!
( 18 − 18 )!
18 P 18 =
18!
0!
18 P 18 =
18!
1
18 P 18 =18!
To find 18!, enter the following into your TI calculator:
1 8 MATH I I I (PRB) 4 (!) ENTER
After pressing
ENTER, you should see the following on your calculator’s screen:
Now let’s compute 18 P 18 with thenProption on the PRB menu.
To find the answer, enter the following into your TI calculator:
1 8 MATH I I I (PRB) 2 (nPr) 1 8 ENTERAfter pressing
ENTER, you should see the following on your calculator’s screen: