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Let the arc AC of a circle subtend a right angle at the centre O. If the point B on the arc AC, divides the arc AC such that BC arc of length AB arc of length = 5 1 , and OB OA OC β + α = , then α = β − ) 1 3 ( 2 is equal to-

1. 3 2 −
2. 3 2
3. 3 5
4. 3 2 +

Correct answer: 3 2 −

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