show that 7n cannot end with the digit zero,for any natural number n.
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7n cannot end with 0 for any number n because
7=7×1
It does not have 5 and 2 as its factors
therefore 7n cannot end with 0.
7=7×1
It does not have 5 and 2 as its factors
therefore 7n cannot end with 0.
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