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Let A =   2 2 ) 1 x ( 4 y x 2 , 0 y : R ) y , x (       and B =     2 ) 1 x ( 4 , x 2 min y 0 : R R ) y , x (       Then the ratio of the area of A to the area of B is

1. 1   
2. 1 1    
3. 1 1    
4. 1   

Correct answer: 1 1    

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