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Let X = {1, 2, 4, 8, 16, …}
Which of the following correctly defines X?
1 ∈ X; if x ∈ X then x * 2 ∈ X.
0 ∈ X; if x ∈ X then x * 2 ∈ X.
1 ∈ X; if x ∈ X then x * x ∈ X.
0 ∈ X; if x ∈ X then x * x ∈ X.
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