20021201
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
CALC
Func
}
10
,
4
w
permutations are possible
when you have 10 different
objects and arrange them
four at a time?
10
P
4
= 5040
How many different
CALC
Func
{
10
,
4
w
combinations are possible
when you have 10 different
objects and remove four at
a time?
10
C
4
= 210
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
Func
[judge]
1
=
1
w
true or false?
1 = 1
TRUE
Is the following expression
Func
[judge]
1
0
w
true or false?
1 < 0
FALSE
2-4-9
Function Calculations
n
!
n
C
r
= –––––––
r
! (
n
–
r
)!
n
!
n
P
r
= –––––
(
n
–
r
)!
