Texas Instruments TI-34 II Teachers Guide - Page 89
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 A B AB and BA count as only 1 combination. C D AB AC AD BA BC BD CA CB CD DA DB DC Press 4 H " Display nPr -n-C-r ! ¹ 2 < 4 nCr 2 º 6. H © 1999 TEXAS INSTRUMENTS INCORPORATED TI-34 Û: A Guide for Teachers 83
© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI
-
34
Û
: A Guide for Teachers
83
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
---
2
<
4 nCr 2
º
6.