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N000ughty Thoughts

How many noughts are at the end of these giant numbers?

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Lyndon chose this as one of his favourite problems. It is accessible but needs some careful analysis of what is included and what is not. A systematic approach is really helpful.

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Trailing Zeros

Weekly Problem 13 - 2009
How many zeros does 50! have at the end?


Stage: 4 Challenge Level: Challenge Level:2 Challenge Level:2

How many zeros are there at the end of the number which is the product of first hundred positive integers?