If Aᵢ = {−i, …, −2, −1, 0, 1, 2, …, i}, then ⋃ᵢ₌₁^∞ Aᵢ is
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Correct answer: A. Z
Explanation
Every integer n lies in A_|n| (or A₁ for 0), and only integers appear, so the union is Z.
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