Texas Instruments BA-20 Profit Manager User Manual - Page 14

Parentheses, Factorial, Random Numbers, Combinations, Permutations, Rounding

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Parentheses 9 : Use parentheses to control the order in which the calculator evaluates a numeric expression in division, multiplication, powers, roots, and logarithm calculations. The calculator includes up to 15 levels of parentheses and up to 8 pending operations. Note: You do not have to press : for expressions ending in a series of closed parentheses. Pressing N closes parentheses automatically, evaluates the expression, and displays the final result. To view intermediate results, press : once for each open parenthesis. Factorial & g The number for which you compute a factorial must be a positive integer less than or equal to 69. Random Numbers & a The calculator generates a random real number between zero and one (0

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10
Overview of Calculator Operations
Parentheses
9 :
Use parentheses to control the order in which the calculator evaluates a
numeric expression in division, multiplication, powers, roots, and
logarithm calculations. The calculator includes up to 15 levels of
parentheses and up to 8 pending operations.
Note:
You do not have to press
:
for expressions ending in a series of
closed parentheses. Pressing
N
closes parentheses automatically,
evaluates the expression, and displays the final result. To view
intermediate results, press
:
once for each open parenthesis.
Factorial
& g
The number for which you compute a factorial must be a positive integer
less than or equal to 69.
Random Numbers
& a
The calculator generates a random real number between zero and one
(0<x<1) from a uniform distribution.
You can repeat a sequence of random numbers by storing a
seed
value in
the random number generator. Seed values help you recreate
experiments by generating the same series of random numbers.
To store a seed value, key in an integer greater than zero and press
D
& a
.
Combinations
& s
The calculator computes the number of combinations of
n
items taken
r
at a time. Both the
n
and
r
variables must be greater than or equal to 0.
Permutations
& m
The calculator computes the number of permutations of
n
items taken
r
at a time. Both the
n
and
r
variables must be greater than or equal to 0.
Rounding
& o
The calculator computes using the rounded, displayed form of a number
instead of the internally stored value.
nCr
n
!
n
r
)
!
r
!
×
–
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nPr
n
!
n
r
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