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If the area (in sq. units) of the region {(x, y) : y 2 ≤ 4x, x + y ≤ 1, x ≥ 0, y ≥ 0} is a 2 + b, then a – b is equal to :

1. 3 8
2. 6
3. 3 10
4. 3 2 −

Correct answer: 6

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