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1 factorial is equal to 1?

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Yes.

In general, take any natural number n. We can find n factorial by multiplying n by each natural number that is less than n. So 4! is 4x3x2x1.
In the case of 1! it is just 1 since there are no natural numbers less than 1.
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In Algebra

What is 1 factorial?

1 factorial = 1