2. Questions Bank
  3. 9th Class
  4. Mental Ability
  5. Series Completion

9th Class Mental Ability Series Completion Question Bank Series Completion

  • question_answer
    In the series \[3,\text{ }9,\text{ }15,\text{ }\ldots ,\] what will be the \[{{35}^{st}}\]term?

    A) 117                    

    B)         200

    C) 207   

    D)        229

    E) None of these

    Correct Answer: C

    Solution :

    Explanation Option [c] is correct. Clearly, \[3+6=9,\text{ }9+6=15,\text{ }......\] So, the series is an A.P. in which a = 3 and d = 6. n = 35 \[\therefore \] 35st term \[=a+\left( 35-1 \right)\,\,d=a+34d=3+34 \times  6-3+204=207\]                 


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