so that 15 n cannot end with the digit 2/0/4/8/6
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The prime factorization of 15 doesn't have a 2 and 5 as its factor. So, its factorization will never end in 10 as a number ending in 10 must have a factors as 5 and 2. So, 15n will never end in zero as 15 doesn't has 2 as a factor.
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15 n cannot end with the digit 2/4/8/6
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