What is the number of zeros at the end of the product of the numbers from 1 to 100?

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1. 1×2×…100=100!
   Number of zeros in product of n numbers =[5n​]+[52n​]+[53n​]+…
   Number of zeros in product of 100 numbers =[5100​]+[52100​]+[53100​]
   where [.] is greatest integer function
   =[20]+[4]+[0.8]=20+4=24

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