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Factor Theorem

Why 0! zero f...

Question

Why 0! (zero factorial) is 1(one)

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Solution

$n! = n \times (n - 1)!$
Therefore, $1! = 1 \times (1 - 1)!$
$\Rightarrow \frac{1}{1} = 0!$
$\Rightarrow 0! = 1$

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