Texas Instruments TI-30XIIS Teachers Guide - Page 77
Permutation nPr
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Permutation (nPr) 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 ABC D AB and BA count as 2 permutations. AB AC AD BA BC BD CA CB CD DA DB DC Press 4 H 2 < Display n-P-r- nCr ! & DEG 4 nPr 2 ' 12. DEG H © 1999 TEXAS INSTRUMENTS INCORPORATED TI-30X ÙS: A Guide for Teachers 70
© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-30X
Ù
S: A Guide for Teachers
70
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
H
AB and BA
count as 2
permutations.
AB
AC
AD
BA
BC
BD
CA
CB
CD
DA
DB
DC
Press
Display
4
H
nPr
nPr
nCr
nCr
!
!
&
---
---
DEG
2
<
4 nPr 2
4 nPr 2
'
12.
12.
DEG
Permutation (nPr)