User Manual

12
© 2006 TEXAS INSTRUMENTS INCORPORATED TI-30XS MultiView: A Guide For Teachers 89
Probability
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 of a
number.
Rand Generates a random number
between 0 and 1.
Randint( Generates a random integer
between 2 integers, A and B ,
where A  Randint  B .
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.
• You can store (L) an integer to Rand just
as you would store values to memory
variables. If you wish to control the random
numbers generated by all calculators in your
class, have all students store the same
number to Rand; the sequence of random
numbers is then the same on all of the
calculators.
•For Randint, use a comma to separate the 2
numbers that you specify.
1