11
Ti30xa School Edition.doc TI-30Xa SOLAR School Edition
Bob Fedorisko Revised: 05/16/03 9:26 AM Printed:
05/16/03 9:32 AM Page 11 of 23
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.
