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11th Class Mathematics Sequence and Series Question Bank Sequence and Series (A.P., G.P. and H.P.)

  • question_answer
    Find the 21st term of an AP whose first term is 4 and the common difference is 3.

    A)  57                               

    B)  60               

    C)  66                   

    D)  64

    Correct Answer: D

    Solution :

    (d): The nth term of an AP is given by \[{{T}_{n}}=a+(n-1)\], where a is the first term and d is the common difference. \[\therefore {{T}_{21}}=4+(21-1)3=4+60=64\]


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