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A = {8, 9, 10, 11, 12, 13, 14, 15, 16}
B = {1, 3, 5, 7, 9, 11, 13, 15, 17, ...}
C = {12, 13, 14, 15}
A ∩ B = {8, 9, 10, 11, 12, 13, 14, 15, 16} ∩ {1, 3, 5, 7, 9, 11, 13, 15, 17, ...}
A ∩ B = {9, 11, 13, 15}
A ∩ B - C ----- {9, 11, 13, 15} - {12, 13, 14, 15} = {9, 11}
9 + 11 = 20
Letra C
B = {1, 3, 5, 7, 9, 11, 13, 15, 17, ...}
C = {12, 13, 14, 15}
A ∩ B = {8, 9, 10, 11, 12, 13, 14, 15, 16} ∩ {1, 3, 5, 7, 9, 11, 13, 15, 17, ...}
A ∩ B = {9, 11, 13, 15}
A ∩ B - C ----- {9, 11, 13, 15} - {12, 13, 14, 15} = {9, 11}
9 + 11 = 20
Letra C
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