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  5. Number System and its Operations

SSC Quantitative Aptitude Number System and its Operations Question Bank Numbers and Their Principles (II)

  • question_answer
    If a clock strikes appropriate number of times at each hour, how many times will it strike in a day?

    A) 300

    B) 156

    C) 68

    D) 78

    Correct Answer: B

    Solution :

    [b] According to the question, the clock strikes one time at 1' o clock, two times at 2' o clock,...., twelve times at 12' o clock. Thus, total number of strikes in a day \[=2\,\,(1+2+3+4+....+12)\] \[=\frac{2\times 12\times (12+1)}{2}\] \[=12\times 13=156\]


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