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If n(A) = 7; n(B) = 9, n(A ∩ B) = 4; then n[(A × B) ∩ (B × A)] is equal to

Answer» If n(A) = 7; n(B) = 9, n(A ∩ B) = 4; then n[(A × B) ∩ (B × A)] is equal to


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