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[" prove that "(a)/(p)(q-r)+(-)/(q)(r-p)+-(p-q)=0],[" The ratio of the sums of "m" and "n" terms of an A.P.is "m^(2):n^(2)" .Show that the ratio "],[" of "m^(" th ")" and "n^(" th ")" term is "(2m-1):(2n-1)]

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