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A) show that the sum of the first n term of an A.P with first term and common difference 1/2n(2a+(n-1)d,1st term 5and common difference 2and consist 3n terms given that the sum of the last nth term are in the ratio 7:27, find n and the sum of the middle n term,hence show that the sum of the first n term and second n term is in the ratio 7:17
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