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Let Z be the set of integers. If } 1 2 : Z x { A ) 6 x 5 x ( ) 2 x ( 2 = ∈ = + − + and } 9 1 x 2 3 : Z x { B < − < − ∈ = , then the number of subsets of the set A × B, is :

1. 2 12
2. 2 18
3. 2 10
4. 2 15

Correct answer: 2 15

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