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Question

Let sn=11.4+14.7+17.10+... to n terms. Then limnsn is equal to

A
13
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B
3
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C
14
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D
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Solution

The correct option is D 13
sn=11.4+14.7+17.10+...sn=n=11(3n2)(3n+1)=n=113(13n213n+1)
Hence
limnsn=limnn=113(13n213n+1)=limn(13(113n+1))=13
Hence, option 'A' is correct.

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