Correto: 3 + 9 = 12, 7 + 4 = 11, 8 + 5 = 13, 8 + 6 = 14, 9 + 4 = 13, 6 + 7 = 13, 8 + 9 = 17, 9 + 6 = 15, 7 + 8 = 15, 9 + 7 = 16, Incorreto: 3 + 9 = 11, 7 + 4 = 12, 8 + 5 = 12, 8 + 6 = 15, 9 + 4 = 12, 6 + 7 = 12, 8 + 9 = 16, 9 + 6 = 16, 7 + 8 = 14, 9 + 7 = 17,

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