Question

    What should come in place of question mark ‘?’ in the following number series?

    18      ?      20      13      

    22       11
    A 14 Correct Answer Incorrect Answer
    B 15 Correct Answer Incorrect Answer
    C 16 Correct Answer Incorrect Answer
    D 18 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    18 - 3 =  15 15 + 5 = 20 20 - 7 = 13 13 + 9 = 22 22 - 11 = 11

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