Question

    Select the number which can be placed in the column of question mark sign.

    A 56 Correct Answer Incorrect Answer
    B 52 Correct Answer Incorrect Answer
    C 58 Correct Answer Incorrect Answer
    D 57 Correct Answer Incorrect Answer

    Solution

    18 2 - 16 2   = 68

    10 2 - 4 2   = 84

    Similarly,  11 2 - 8 2   = 57

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