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Probability Functions
The
PROB
menu
calculates
combinations,
permutations and factorials,
and
generates
sequences
of
random
numbers.
Gombinations and Permutations.
The
number of clmbinations of
x
objects taken
y at
a
time
(C*,y)
is
the number
of different
sets
containirg
y
items
that
can
be taken
from
a
larger group
of x items. No item
occurs
more
than
once
in
the
set
of y items, and different
orders
of
the
same
y
items
are
not counted
separately.
The number
of
permutations
of x
objects taken
y at a time
(P*,y)
is
the
number
of
different
arrangements
of y
items
that
can
be taken from
a
larger
group
of x
items.
No
items can occur more
than once
in an
ar-
rangement,
and different orders
of
the
same
y
items
are counted
separately.
Combinations
of X
objects
taken
Y
ata
time
Permutations
of X
objects
taken
Y
ala
time
Keys:
It
pRoB]
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r+i
Display:
H=5,
BBBB
Y=3,
BEBE
H,
Y= 1B
,
BBBA
H,
Y=68
,
BBBB
Description:
Displays
the
PROB menu.
Stores
x.
Stores
y.
Calculates combinations.
Calculates permutations.
Exits
the
PROB menu.
tEXtrl
2=
Keyboard Arithmetic and Numeric
Functions
59
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