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Question

A series, whose nth term is (nx)+y, then sum of r terms will be :

A
{r(r+1)2x}+ry
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B
{r(r1)2x}
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C
{r(r1)2x}2xy
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D
{r(r+1)2x}rx
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Solution

The correct option is A {r(r+1)2x}+ry
Let Tn=(nx)+y
Sr=1xr1n+yr11
Sn={r(r+1)2x+ry}

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