SSC Sample Paper SSC CGL - Sample Paper-13

  • question_answer
    Between two book-ends in your study are displayed your five favourite puzzle books. If you decide to arrange the five books in every combination and moved just one book every minute, how long would it take you.

    A) 1 h                               

    B) 2 h

    C) 3 h                               

    D) 4 h

    Correct Answer: B

    Solution :

    Clearly, number ' of ways of arranging 5 books \[=5!=5\times 4\times 3\times 2\times 1=120\] So, total time taken =120 min = 2 h

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