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© 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)
Summary of Contents for -30XIIS - Handheld Scienfic Calculator
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