BCECE Engineering BCECE Engineering Solved Paper-2013

  • question_answer
    Number of identical terms in the sequence 2, 5, 8, 11,... upto 100 terms and 3, 5, 7, 9, 11,... upto 100 terms are

    A)  17                         

    B)  33         

    C)         50         

    D)         147

    Correct Answer: B

    Solution :

    Common terms are 5, 11, 17,... \[\therefore \] term of common sequence, \[{{t}_{n}}=5+(n-1)6=(6n-1)\] Also, 100th term of first sequence \[=2+(100-1)3=299\] and 100th term of the second sequence \[=3+(100-1)2=201\]                 \[\Rightarrow \]               \[{{t}_{n}}\le 201\] \[\Rightarrow \]               \[6n-1\le 201\] \[\Rightarrow \]               \[n\le 33\frac{2}{3}\] \[\therefore \]  \[n=33\]                               \[(\because \,n\in N)\]


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