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OpenStudy (anonymous):
What is the smallest value of N such that the product N! = 1x2x3x...x N ends in at least 10 zeroes?
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OpenStudy (anonymous):
hint, you get a zero for each 2, 5 and 10
OpenStudy (kinggeorge):
Additionally, since you get at least one 2 for every 5, and every 10 has a two and a 5, you really just need to count how many 5's you get.
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