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Q. 14) IfS, S, and S, are respectively the sum ofn. 2n and 3n terms of a G.P, then prove that13 and s, are respectively the sum of n, 2n and 3n terms of a G.P.,that\mathrm{S}_{1}\left(\mathrm{S}_{3}-\mathrm{S}_{2}\right)=\left(\mathrm{S}_{2}-\mathrm{S}_{1}\right)^{2} |
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