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    Question

    Three of the following four number-clusters are alike in

    a certain way and thus form a group. Which is the one that does not belong to that group?
    A 123 Correct Answer Incorrect Answer
    B 259 Correct Answer Incorrect Answer
    C 238 Correct Answer Incorrect Answer
    D 178 Correct Answer Incorrect Answer

    Solution

    123 → 1² + 2 = 1 + 2 = 3 259 → 2² + 5 = 4 + 5 = 9 238 → 2² + 3 = 4 + 3 = 7 ≠ 8 178 →1² + 7 = 1 + 7 = 8   Thus, the odd one out is 238. Hence, the correct answer is (C).

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