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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 20th term from the last term of the AP 3, 8, 13,.?. 253.

    A)  196                             

    B)  158  

    C)  148                 

    D)  138

    Correct Answer: B

    Solution :

    (b): Given, 1 = last term = 253 d = common difference = 8 ? 3 = 5 \[\therefore \] 20th term from the end \[=1-(20-1)d=1-19d=253-19\times 5\]      \[(\because n=20)\]      \[=158\]


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