In Fig if PA and PB are tangents to the circle with centre \( \mathrm{O} \) such that \( \angle ...

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In Fig if PA and PB are tangents to the circle with centre \( \mathrm{O} \) such that \( \angle \mathrm{APB}=50^{\circ} \), then \( \angle \mathrm{OAB} \) is equal
(A) \( 25^{\circ} \quad \) (B) \( 30^{\circ} \)
(C) \( 40^{\circ} \quad \) (D) \( 50^{\circ} \)
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