Texas Instruments TI-30X Teachers Guide - Page 73
Combination nCr
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Combination (nCr) You have space for 2 books on your bookshelf. You have 4 books to put on the shelf. Use this formula to find how many ways you could place the 4 books in the 2 spaces. 4 nCr 2 = x AB AB and BA count as only 1 combination. CD AB AC AD BA BC BD CA CB CD DA DB DC Press 4 H " 2 < Display nPr -n-C-r ! ¹ DEG 4 nCr 2 ' 6. DEG H © 1999 TEXAS INSTRUMENTS INCORPORATED TI-30X ÙS: A Guide For Teachers 69
© 1999
T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-30X
Ù
S: A Guide For Teachers
69
Combination (nCr)
H
You have space for 2 books on your
bookshelf. You have 4 books to put
on the shelf. Use this formula to
find how many ways you could place
the 4 books in the 2 spaces.
4 nCr 2 = x
±±±±
A
B
C
D
AB and BA
count as only 1
combination.
AB AC AD
BA
BC BD
CA
CB
CD
DA
DB
DC
Press
Display
4
H
"
nPr
nCr
!
¹
---
DEG
2
<
4 nCr 2
’
6.
DEG