If the sum of n terms of an A.P. is 3 $n^{2}$ + 5n and $T_{m}$ = 164 then m = ?

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Solution

The correct option is B
27

$T_{m}$ = $S_{m}$ - $S_{m - 1}$ ⇒ 164 = 3(2m - 1) + 5.1 ⇒ m = 27

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