Texas Instruments TI-30X - IIS Scientific Calculator Teachers Manual page 73

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
AB and BA
count as only 1
combination.
Press
4 H "
2 <
© 1999 T I I
EXAS NSTRUMENTS NCORPORATED
B C D
AB AC AD
BA BC BD
CA CB CD
DA DB DC
Display
nPr nCr
---
DEG
4 nCr 2
6.
DEG
! ¹
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TI-30X ÙS: A Guide For Teachers
H
69