show that 2105+3105 is divisible by 5,7,11,25 but not by13.
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2105 + 3105 = 5210
5210/ 5 = 142 ////
5210 /7 = no
5210/11 = no
5210/25 = no
5210/13= no
5210/ 5 = 142 ////
5210 /7 = no
5210/11 = no
5210/25 = no
5210/13= no
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