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If the sum of `n` terms of an A.P. is `3n^2+5n` and its mth term is 164, find the value of `mdot`

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If the sum of `n` terms of an A.P. is `3n^2+5n` and its mth term is 164, find the value of `mdot`
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Correct Answer - m=27
` T_(n) = (S_(n) -S_(n-1)_=(3n^(2)+5n) -(3n^(2)-n-2) = (6n +2)`
T_(m)=164 Rightarrow +2 =164 Rightarrow 6m = 162 Rightarrow m=27`
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