If , simplify . Use your result to find the sum of the first n terms of the series : For the first part , i got .. is this correct . But from here , i couldn't relate to the second problem .
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Originally Posted by thereddevils If , simplify . Use your result to find the sum of the first n terms of the series : Mr F says: Correction in red. For the first part , i got .. is this correct . But from here , i couldn't relate to the second problem . When the first part is answered completely the second part should become clearer: . Therefore: . By the way, the result in the second part of the question has a typo which I have corrected.
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