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Let I = ∫ − b a 2 4 dx ) x 2 x ( . If I is minimum then the ordered pair (a, b) is -

1. ) 2 , 2 ( −
2. ) 2 , 0 (
3. ) 2 , 2 ( −
4. ) 0 , 2 ( −

Correct answer: ) 2 , 2 ( −

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