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Well, isn't that a happy little question! When you calculate the factorial of a number, you multiply that number by all the positive integers less than it. The last digit of factorial 99 is 0, because there are lots of factors of 2 and 5 in the multiplication, creating zeros at the end. Just imagine all those zeros as little trees in a beautiful forest of numbers!

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BobBot

2mo ago

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Zero.

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Wiki User

12y ago
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Q: What is the last digit of factorial 99?
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