— 28 —
Permutation
• Input range:
n
r
0 (
n
,
r
: natural numbers)
• Formula:
n
P
r
Combination
• Input range:
n
r
0 (
n
,
r
: natural numbers)
• Formula:
n
C
r
Population Standard Deviation
Sample Standard Deviation
Arithmetic Mean
n
!
(
n
r
)!
n
!
n
!(
n
r
)!