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    Question

    The second number in the given number-pairs is obtained

    by performing certain mathematical operation(s) on the first number. The same operation(s) is/are followed in all the number-pairs except one. Find that odd number-pair.
    A 11: 38 Correct Answer Incorrect Answer
    B 18: 59 Correct Answer Incorrect Answer
    C 22: 71 Correct Answer Incorrect Answer
    D 13: 42 Correct Answer Incorrect Answer

    Solution

    The pattern followed here is as follows:

    (First number ├Ч 3) + 5 = Second number

    11: 38 тЖТ (11 ├Ч 3) + 5 = 33 + 5 = 38

    18: 59 тЖТ (18 ├Ч 3) + 5 = 54 + 5 = 59

    22: 71 тЖТ (22 ├Ч 3) + 5 = 66 + 5 = 71

    13: 42 тЖТ (13 ├Ч 3) + 5 = 39 + 5 = 44 (should be 44, not 42)

    So, 13: 42 is the odd number-pair.

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