Jun 25, 2020
Factorials
-- made up of factors
-- n! = n (n - 1) (n - 2) ...
Examples:
2! = 2 (2 - 1) 2! = 2 (1) 2! = 2
3! = 3 (3 - 1) (3 - 2) 3! = 3 (2) (1) 3! = 6
5! = 5 (5 - 1) (5 - 2) (5 - 3) (5 - 4) 5! = 5 (4) (3) (2) (2) 5! = 120
7! = 7 (7 - 1) (7 - 2) (7 - 3) (7 - 4) (7 - 5) (7 - 6) 7! = 7 (6) (5) (4) (3) (2) (1) 7! = 5040
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