Texas Instruments TI-30X - IIS Scientific Calculator Teachers Manual page 75

Factorial (!)
Using the digits 1, 3, 7, and 9 only
one time each, how many 4-digit
numbers can you form?
1
A
ABCD ABDC ACBD
BACD BADC BCAD
CABD CADB CBAD
DABC DACB DBAC
Press
4 H " "
< <
© 1999 T I I
EXAS NSTRUMENTS NCORPORATED
4! = x
3 7 9
B C D
ACDB ADBC
BCDA BDCA
CBDA CDAB
DBCA DCAB
Display
nPr nCr
4!
ADCB
BDAC
CDBA
DCBA
! ¹
-
DEG
'
24.
DEG
TI-30X ÙS: A Guide For Teachers
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