Texas Instruments TI-30XIIS Teachers Guide - Page 76
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 BCD AB and BA count as only 1 combination. AB AC AD BA BC BD CA CB CD DA DB DC Press 4 H " 2 < Display nPr -n-C-r ! & 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
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
H
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
nPr
nCr
nCr
!
!
&
---
---
DEG
2
<
4 nCr 2
4 nCr 2
'
6.
6.
DEG
Combination (nCr)