Texas Instruments TI-30X IIS User Manual page 76

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