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11th Class Mathematics Sequence and Series Question Bank Sequence and Series

  • question_answer
    If \[{{\mathbf{S}}_{\mathbf{n}}}\]of a series is \[\frac{\mathbf{35n}}{\mathbf{2}}\mathbf{-}\frac{\mathbf{7}{{\mathbf{n}}^{\mathbf{2}}}}{\mathbf{2}}\] then find its 7th term.

    A) -21                    

    B) 35          

    C) 18                                

    D) -28

    E) None of these

    Correct Answer: D

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