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# Factorial II

#### Description

In mathematics, the factorial of a non-negative integer $$n$$, denoted by $$n!$$, is the product of all positive integers less than or equal to $$n$$

For example:

$$5!=5\times4\times3\times2\times1=120$$

#### Question

How many '0's are there at the end of 21082017! ?

How many '0's are there at the end of 21082017! ?