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Question

The sum to 2n terms of the series - 53+4×63+73+4×83+93....is?


A
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B
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C
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D

none of these

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Solution

The correct option is C

At n=1, 2n= 2.

Sum to 2n terms = 125 + 864 = 989.

Substitute n=1 in answer options. Only option (c) gives 989.


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