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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 18: 59 Correct Answer Incorrect Answer
    B 20: 65 Correct Answer Incorrect Answer
    C 11: 38 Correct Answer Incorrect Answer
    D 19: 61 Correct Answer Incorrect Answer
    E 24: 77 Correct Answer Incorrect Answer

    Solution

    The pattern followed here is as follows:

    (First number × 3) + 5 = Second number

    18: 59 → (18 × 3) + 5 = 54 + 5 = 59

    20: 65 → (20 × 3) + 5 = 60 + 5 = 65

    11: 38 → (11 × 3) + 5 = 33 + 5 = 38

    19: 61 → (19 × 3) + 5 = 57 + 5 = 62 (should be 62, not 61)

    24: 77 → (24 × 3) + 5 = 72 + 5 = 77

    So, 19: 61 is the odd number-pair.

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