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In the given figure, $AB$ is diameter of the circle with centre $O$. $CD$ is tangent to the circle so that $\angle ACD = 40^\circ$. The value of $\angle CBA$ is
- (a)$50^\circ$
- (b)$40^\circ$
- (c)$80^\circ$
- (d)$45^\circ$
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Ans: (B) $40^\circ$