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Puzzle - Answer

Can you replace the question marks with mathematics symbols (+-/x=) and make the equation correct:

((6 ? 7) ? (2 ? 3)) ? (4 ? 1) = 9

 [Ref: ZZHP] © Kevin Stone

Answer:

((6 + 7) + (2 - 3)) - (4 - 1) = 9
((6 + 7) - (2 - 3)) - (4 + 1) = 9
((6 - 7) + (2 + 3)) + (4 + 1) = 9
((6 - 7) + (2 x 3)) + (4 x 1) = 9
((6 - 7) + (2 x 3)) + (4 / 1) = 9
((6 x 7) - (2 x 3)) / (4 x 1) = 9
((6 x 7) - (2 x 3)) / (4 / 1) = 9

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