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If a ,b ,c ,d are in G.P., then prove th...

If `a ,b ,c ,d` are in G.P., then prove that `(a^3+b^3)^(-1),(b^3+c^3)^(-1),(c^3+d^3)^(-1)` are also in G.P.

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CENGAGE PUBLICATION-SEQUENCES AND SERIES-All Questions
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  8. Find the sum of the series 1+3x+5x^2+7x^3+..........upto n terms.

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