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The value of sum(r=1)^n{(2r-1)a+1/(b^r)}...

The value of `sum_(r=1)^n{(2r-1)a+1/(b^r)}` is equal to (a)`a n^2+(b^(n-1)-1)/(b^n(b-1))` . (b) `a n^2+(b^(n)-1)/(b^n(b-1))` (c) `a n^3+(b^(n-1)-1)/(b^n(b-1))` (d) none of these

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RD SHARMA ENGLISH-SOME SPECIAL SERIES-All Questions
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  19. Find the sum to n terms of the series 1xx2+2xx3+ 3xx4+ 4xx5+......

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  20. Find the sum of the following series to n term: 3xx1^2+5xx2^2+7xx3^2+....

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