Correcto: 3 + 4 = 7, 5 + 2 = 7, 6 +1 = 7, 3 + 3 + 1 =7, 1 + 1 + 5 = 7, Incorrecto: 3 + 3 + 2 = 7, 1 + 1 +1 +1 +4 = 7, 2 + 2 + 4= 7, 6+2= 7, 5+3 + 1=,

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