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Sabemos que:
AxB = { (a,b) / a ∈ A ∧ b ∈ B}
Entonces:
AxB = { (3,1) , (3,3) , (3,9) , (8,1) , (8,3) , (8,9) }
BxA = { (1,3) , (1,8) , (3,3) , (3,8) , (9,3) , (9,8) }
(AxB) Ω (BxA) = { (3,3) }
Rpta: Tiene un solo elemento.
saludos.