CodingBat socialSum

socialSum

Given 3 input integers, return the sum of all 3 if none is equal to each other. If exactly two are equal, return the third number. If all three are equal, return -1.

socialSum(1, 2, 3) → 6
socialSum(1, 2, 2) → 1
socialSum(4, 4, 4) → -1

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Difficulty: 100

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