Texas Instruments TI-30X Teachers Guide - Page 72

Probability - factorial

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Probability 11 Keys 1. H displays the following menu of functions. nPr Calculates the number of possible permutations. nCr Calculates the number of possible combinations. ! Calculates the factorial. RAND Generates a random 10digit real number between 0 and 1. RANDI Generates a random integer between 2 numbers that you specify. Notes • The examples on the transparency masters assume all default settings. • A combination is an arrangement of objects in which the order is not important, as in a hand of cards. • A permutation is an arrangement of objects in which the order is important, as in a race. • A factorial is the product of all the positive integers from 1 to n, where n is a positive whole number  69. • To control a sequence of random numbers, you can store (L) an integer to RAND just as you would store values to memory variables. The seed value changes randomly when a random number is generated. • For RANDI, use a comma to separate the 2 numbers that you specify. 1 © 1999 TEXAS INSTRUMENTS INCORPORATED TI-30X ÙS: A Guide For Teachers 68

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© 1999
T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-30X
Ù
S: A Guide For Teachers
68
Probability
11
Keys
1.
H
displays the following menu of
functions.
nPr
Calculates the number of
possible permutations.
nCr
Calculates the number of
possible combinations.
!
Calculates the factorial.
RAND
Generates a random 10-
digit real number between
0 and 1.
RANDI
Generates a random
integer between 2 numbers
that you specify.
Notes
•
The examples on the transparency masters
assume all default settings.
•
A
combination
is an arrangement of
objects in which the order is not important,
as in a hand of cards.
•
A
permutation
is an arrangement of
objects in which the order is important, as
in a race.
•
A
factorial
is the product of all the positive
integers from 1 to
n
, where
n
is a positive
whole number
±
69.
•
To control a sequence of random numbers,
you can store (
L
) an integer to
RAND
just as you would store values to memory
variables. The seed value changes randomly
when a random number is generated.
•
For
RANDI
, use a comma to separate the 2
numbers that you specify.
1