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SSC Quantitative Aptitude Number System and its Operations Question Bank Number Series and Sequences (I)

  • question_answer
    Which term of the sequence \[\frac{1}{2},\]\[-\frac{1}{4},\]\[\frac{1}{8},\]\[-\frac{1}{16},...\]is \[-\frac{1}{256}?\]

    A) 9th

    B) 8th

    C) 7th

    D) 5th

    Correct Answer: B

    Solution :

    [b] The sequence is \[\frac{1}{2},\]\[-\frac{1}{{{2}^{2}}},\]\[\frac{1}{{{2}^{3}}},\]\[-\frac{1}{{{2}^{4}}},...,\]\[\frac{1}{-\,\,{{2}^{8}}}\] \[\therefore \] 8th term will be \[-\frac{1}{256}.\]


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