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In the adjoining figure, AP and AQ are tangents to the circle with centre O. If reflex $\angle POQ = 210^{\circ}$, the value of $2x$ is
- (a)$30^{\circ}$
- (b)$60^{\circ}$
- (c)$120^{\circ}$
- (d)$300^{\circ}$
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(B) $60^{\circ}$