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k
Permutation (
n
P
r
) and Combination (
n
C
r
)
u
Total Number of Permutations
u
Total Number of Combinations
Problem
Use this keyboard:
Operation
mth abc cat 2D
How many different
permutations are possible
when you have 10 different
objects and arrange them
four at a time?
10
P
4
= 5040
CALC Func
}
10
,
4
w
How many different
combinations are possible
when you have 10 different
objects and remove four at
a time?
10
C
4
= 210
CALC Func
{
10
,
4
w
k
Condition Judgment (judge, piecewise)
The “judge” function returns TRUE when an expression is true, and FALSE when it is false.
Problem
Use this keyboard:
Operation
mth abc cat 2D
Is the following expression
true or false?
1 = 1 TRUE
Func [judge] 1
=
1
w
Is the following expression
true or false?
1 < 0 FALSE
Func
[judge] 1 0
w
2-4-9
Function Calculations
n
!
n
P
r
= –––––
(
n
–
r
)!
n
!
n
C
r
= –––––––
r
! (
n
–
r
)!