Genetics and law of probability how to solve problems using factorial method
Factorial Notation is used when you need to work with a series of factors, each being one less than the previous factor.
Instead of writing out 5 · 4 · 3 · 2 · 1,
we use factorial notation and write
5! = 120.
(Note: 0! = 1 and 1! = 1)
Examples:
a) 6! = 6 ·5 ·4 ·3 ·2 ·1 = 720
b) (10 - 6)! = 4! = 4 ·3 ·2 ·1 = 24
c) 10! = 10 ·9 ·8 ·7 ·6 ·5 ·4 ·3 ·2 ·1
3! · 2! 3 ·2 ·1 · 2 ·1
= 3628800 = 302,400
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