Let the universe of discourse N be the set of natural integers. Consider the following families of sets: Ak = {n ∈ N |0 ≤ n ≤ k} Bk = {n ∈ N | n ≥ k} Knowing that i < j, give the cardinality of the following set as a function of I and j. If the set is infinite, write infinite. 1.Aj ∩ Bi 2.Ai ∩ Bj 3.Ai ∩ Aj

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