Texas Instruments TI-30X - IIS Scientific Calculator - Page 74

© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-30X ÙS: A Guide For Teachers
70
Permutation (nPr)
H
Four different people are running in
a race. Use this formula to find how
many different ways they can place
1
st
and 2
nd
.
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 Display
4 H
nPr nCr !
¹
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DEG
2 <
4 nPr 2
'
12.
DEG