Texas Instruments TI-30Xa Solar - Manual (Page 13)

12
TI30XAUS.DOC MURFE pruning Pat Hatcher Revised:
06/17/99 4:31 PM Printed: 06/17/99 4:32 PM Page 12 of 21
Probability
A combination is an arrangement of objects in which
order is not important, as in a hand of cards.
" i
calculates the number of possible combinations of n
items taken r at a time.
Calculate the number of 5-card poker hands that can be
dealt from a deck of 52 cards.
52 " i 5 J 2598960.
A permutation is an arrangement of objects in which
the order is important, as in a race.
" j calculates
the number of possible permutations of n items taken r
at a time.
Calculate the number of possible permutations for the
1st-, 2nd-, and 3rd-place finishers (no ties) in an 8-
horse race.
8 " j 3 J 336.
A factorial is the product of the positive integers from 1
to
n . ( n must be a positive whole number  69).
Using the digits 1, 3, 7, and 9 only one time each, how
many 4-digit numbers can you form?
4 " v 24.