prove that there is no natural number for which 4^n ends with the digit zero
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if 4^n ends with the Digit zero then in their prime factoraisation 5 must be contain but in factorisation of 4^n , 5 is not contain thats why no Natural number for which 4^n ends 6with the digit 0
prime factoraisation of 4^n is 2 and 2
prime factoraisation of 4^n is 2 and 2
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