Texas Instruments TI-34 II Explorer Plus - Page 90

© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-34 Û: A Guide for Teachers
84
Permutation (nPr)
H
Four different people are running
in a race. Use this formula to find
how many different ways they can
place 1st and 2nd.
4 nPr 2 = x
A B C D
AB and BA
count as 2
permutations.
AB AC AD
BA BC BD
CA CB CD
DA DB DC
Press Display
4
H
nPr nCr !
¹
------
2
<
4 nPr 2
º
12.