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Нехай А = ∅ . Яка з поданих множин є множиною всіх підмножин множини А?
{ ∅ }
{ ∅ , {1}, {2}, {3}, {1, 2}, {2, 3}, {3, 1}, {2, 3, 1}}
∅
{ ∅ , { ∅ }}
{{ ∅ }, { ∅ }}
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