47
Chapter 3: Manual Calculations
Note:
The random functions (random) will generate different
numbers every time when the display is redrawn.
Therefore, the table values of the random functions will
be different every time. When in case of random-based
graphing calculations, the tracing values and other
parameters of the graph will not match the graph's
visual representation.
2 nPr
Returns the total number of different arrangements
(permutations) for selecting “r” items out of “n” items.
n
P
r
=
n!
(n
–
r)!
Example
• How many different ways can 4 people out of 6 be
seated in a car with four seats?
6
M
C
2
4
E
3 nCr
Returns the total number of combinations for selecting
“r” item out of “n” items.
n
C
r
=
n!
r!(n
–
r)!
Example
• How many different groups
of 7 students can be
formed with 15 students?
1 5
M
C
3
7
E
4 !
Returns a factorial.
Example
• Calculate 6
×
5
×
4
×
3
×
2
×
1.
6
M
C
4
E
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