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Let the line x + y = 1 meet the circle x 2 + y 2 = 4 at the points A and B. If the line perpendicular to AB and passing through the mid point of the chord AB intersects the circle at C and D, then the area of the quadrilateral ADBC is equal to :

1. 3 7
2. 2 14
3. 5 7
4. 14

Correct answer: 2 14

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