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Banking Sample Paper IBPS Clerk (Main) Sample Paper Test-1

  • question_answer
    Direction: What should come in place of question mark (?) in the following number series?
    5  3  3  5  15  ?

    A)  69                               

    B)  62                   

    C)    59                   

    D)    72                   

    E)    78

    Correct Answer: A

    Solution :

    The series is \[\times 1-2,\]\[\times \,2-3,\]\[\times \,3-4,\]\[\times \,4-5,\]? i.e. \[5\times 1-2=3,\] \[3\times 2-3=3,\]\[3\times 3-4=5,\]\[5\times 4-5=15,\]\[15\times 5-6=69,\,...\]


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