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q1, Let A, B be sets such that A ∩ B = B. Show that B...

q1, Let A, B be sets such that A ∩ B = B. Show that B − A = ∅

q2, (∀x ∈ N)(∀y ∈ N). (xy = 0 ⇒ (x = 0 ∧ y = 0)) It is true or not

Thanks

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