In the given figure, O is the centre of a circle. If ∠ O A B=40^∘ and C is a point on the circle ...

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In the given figure, O is the centre of a circle. If ∠ O A B=40^∘ and C is a point on the circle then ∠ A C B= ?
(a) 40^∘
(b) 50^∘
(c) 80^∘
(d) 100^∘

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