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Find the sum of the series 1+2x+3x^2+(n-...

Find the sum of the series `1+2x+3x^2+(n-1)x^(n-2)` using differentiation.

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RESONANCE DPP-CONTINUITY AND DIFFERENTIABILITY-All Questions
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  10. Find the sum of the series 1+2x+3x^2+(n-1)x^(n-2) using differentiatio...

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  17. If y="sec"(tan^(-1)x), then (dy)/(dx) at x=1 is equal to: 1/(sqrt(2)) ...

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