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If the ratio of the sum of m terms and n terms of an A.P be m^2 : n^2 , prove that the ratio of m^th

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If the ratio of the sum of m terms and n terms of an A.P be m2 : n2 , prove that the ratio of mth and nth terms is (2m -1) : (2n- 1). 

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Subtracting equation (ii) from (i), 

Substituting value of d in equation (i), 

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