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nick1816
N! is ending with x zeroes. (N + 3)! is ending with (x + 2) zeroes. How many such N's will exist, given N is positive integer less than 50?

A. 5
B. 6
C. 7
D. 8
E. 9

N+3 = 5^2k = 25k form
N+3 = {25,50}
N = {22,23,24,47,48,49}

IMO B
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