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What is an exclamation next to a number?

Updated: 10/17/2024
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βˆ™ 12y ago

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It is an indicator of the factorial function, which is defined for non-negative integers.

0! = 1

and for n > 0,

n! = n*(n-1)!

so that

n! = 1*2*3* ... *n

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Q: What is an exclamation next to a number?
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