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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!
(nҀr)!
n!
n!(nҀr)!