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Pleaseenter a non-negative number: 3
3! = 3 X 2X 1
= 6Pleaseenter a non-negative number: 10
10! = 10 X9 X 8 X 7 X 6 X 5 X 4 X 3 X 2 X 1
= 3628800
Pleaseenter a non-negative number: -1Invalid input
p/s:output like above

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