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Let α = ! 3 ) ! 4 ( )! ! 4 ( and β = ! 4 ) ! 5 ( )! ! 5 ( . Then:

1. α ∈ N and β ∈ N
2. α ∉ N and β ∈ N
3. α ∈ N and β ∉ N
4. α ∉ N and β ∉ N

Correct answer: α ∈ N and β ∈ N

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