1.

The number of zeros at the end of the product of : 2^3xx3^4xx4^5xx5^6 + 3^5xx5^7xx7^9xx8^(10) + 4^5xx5^6xx6^7xx7^8-10^2xx15^3xx20^4 is :

Answer»

5
6
28
none of these

Answer :B


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