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Question

If sum of n terms of an A.P. is 3n2+5n and Tm=164, then the value of m is


A

26

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B

27

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C

28

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D

25

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Solution

The correct option is B

27


Tm=SmSm1
164=3m2+5m3[3(m1)2+5((m1)]
164=3(2m1)+5×1
6m=162m=27


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