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