The factorial​ symbol, n!, is defined as ​n!equals​_______ and ​0!equals​_______.

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Part 1

The factorial​ symbol, n!, is defined as ​n!equals

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StartFraction n Over r left parenthesis n minus r right parenthesis EndFraction

n left parenthesis n minus 1 right parenthesis times ... times 3 times 2 times 1

Start Fraction n Over n 1 n 2 times times times n Subscript k End Fraction

Start Fraction n Over left parenthesis n minus r right parenthesis End Fraction

and ​0!equals

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1.

0.