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If for every $n \in N,$ , sum to n terms of an A.P. is $5 n^{2} + 7 n$ then its 10th term is

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Correct option is C

We have ar=Sr−Sr−1⇒ a10=S10−S9 =5102−92+7(10−9) =102

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If for every n∈N, , sum to n terms of an A.P. is 5n2+7n then its 10th term is

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If for every $n \in N,$ , sum to n terms of an A.P. is $5 n^{2} + 7 n$ then its 10th term is