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?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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