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20090601
Problem
Use this keyboard:
Operation
mth abc cat 2D
Divide 21 by 6 and 7, and
determine the remainder
of both operations.
(iMod(21, {6, 7})
Func [iMod] 21
W
6
7
Y
U
I
Permutation (
n
P
r
) and Combination (
n
C
r
)
S
Total Number of Permutations
S
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
Z
10
4
U
How many different
combinations are possible
when you have 10 different
objects and remove four at
a time?
10
C
4
= 210
CALC Func
Y
10
4
U
n
!
n
P
r
= –––––
(
n
–
r
)!
n
!
n
P
r
= –––––
(
n
–
r
)!
n
!
n
C
r
= –––––––
r
! (
n
–
r
)!
n
!
n
C
r
= –––––––
r
! (
n
–
r
)!
2-4-11
Function Calculations