Show that 3power n and 4power m cannot end with the digit 0 or 5 for any natural numbers n and m
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4- 2x2
4^m - 2^2^m
if it end with 0 or 5 it should be a factor of5
therefore it won't end with zero
4^m - 2^2^m
if it end with 0 or 5 it should be a factor of5
therefore it won't end with zero
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