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JEE Main & Advanced Mathematics Sequence & Series Question Bank nth term of special series, Sum to n terms and Infinite number of terms

  • question_answer
    \[{{11}^{2}}+{{12}^{2}}+{{13}^{2}}+{{.......20}^{2}}=\] [MP PET 1995]

    A) 2481

    B) 2483

    C) 2485

    D) 2487

    Correct Answer: C

    Solution :

    Required sum\[\Sigma {{(20)}^{2}}-\Sigma {{(10)}^{2}}=2870-385=2485\].


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