Operation Manual

2-12 Math, Angle, and Test Operations
8202MATH.DOC TI-82, Chapter 2, English Bob Fedorisko Revised: 02/09/01 12:20 PM Printed:
02/09/01 12:36 PM Page 12 of 16
MATH PRB (Probability) Operations
To display the MATH PRB menu, press
 |
. When you select an item from the
menu, the name is copied to the cursor location. Functions that are valid for lists
return a list calculated on an element-by-element basis.
MATH PRB Menu
MATH NUM HYP PRB
1: rand
Random number generator
2: nPr
Number of permutations
3: nCr
Number of combinations
4: !
Factorial
rand
rand
(random number) generates and returns a random number greater
than 0 and less than 1. A random number is generated from a seed value. To
control a random number sequence, first store an integer seed value in
rand
. If you store
0
to
rand
, the TI
.
82 uses the factory-set seed value. When
you reset the TI
.
82,
rand
is set to the factory seed.
nPr
nPr
(number of permutations) returns the number of permutations of
items
taken
number
at a time.
items
and
number
must be nonnegative integers.
items
nPr
number
nCr
nCr
(number of combinations) returns the number of combinations of
items
taken
number
at a time.
items
and
number
must be nonnegative
integers.
items
nCr
number
! (Factorial)
!
(factorial) returns the factorial of a positive integer between 0 and 69.
value
!