Show that 13n cannot end with digit 0 for any natural number n.
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If any number ends with the digit 0 or 5, it is always divisible by 5. If 12n ends with the digit zero it must be divisible by 5. This is possible only if prime factorisation of 12n contains the prime number 5. ... Hence, there is no value of n e N for which 12n ends with digit zero or five.
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