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How many zeroes are at the end of 42! (42 factorial)?

 Oct 28, 2018
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42/5 + 42/5^2 =8 + 1 = 9 zeros. Use the integer part only.

42! =1405006117752879898543142606244511569936384,000,000,000. As you can see 42! agrees with the first answer of having 9 zeros.

 Oct 28, 2018

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