Texas Instruments TI-34 II Teachers Guide - Page 91
Factorial
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Factorial (!) Using the digits 1, 3, 7, and 9 only one time each, how many 4-digit numbers can you form? 4! = x 1 37 9 ABC D ABCD ABDC ACBD ACDB ADBC ADCB BACD BADC BCAD BCDA BDCA BDAC CABD CADB CBAD CBDA CDAB CDBA DABC DACB DBAC DBCA DCAB DCBA Press Display 4 H " " nPr nCr --! ¹ < < 4! º 24. H © 1999 TEXAS INSTRUMENTS INCORPORATED TI-34 Û: A Guide for Teachers 85
© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI
-
34
Û
: A Guide for Teachers
85
Factorial (!)
H
Using the digits 1, 3, 7, and 9 only
one time each, how many 4-digit
numbers can you form?
4! = x
1
3
7
9
A
B
C
D
ABCD
BACD
CABD
DABC
ABDC
BADC
CADB
DACB
ACBD
BCAD
CBAD
DBAC
ACDB
BCDA
CBDA
DBCA
ADBC
BDCA
CDAB
DCAB
ADCB
BDAC
CDBA
DCBA
Press
Display
4
H
"
"
nPr nCr
!
¹
--
--
<
<
4!
º
24.