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| Factorial Notation |
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| Let n be a positive integer. The continued product of first n natural numbers is called factorial n and is denoted as n!. |
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| Note: |
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| 1. O!= 1 |
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| 2. When n is a negative or fraction, n! is not defined. |
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| Examples: |
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| 8! = 8 x 7 x 6 x 5 x4 x 3 x 2 x 1 = 40320 |
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Permutations and Combinations
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