show that 2105+3105 is divisible by 5,7,11,25 but not by13.
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hey it is divisible by 5,7,11,25 because it ended with 5
and hence it does not divide by 13 bcos after seeing once we have to see see tens position that is no coorect for 13
and hence it does not divide by 13 bcos after seeing once we have to see see tens position that is no coorect for 13
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