If \( P A \) and \( P B \) are tangents to the circle with centre \...

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If \( P A \) and \( P B \) are tangents to the circle with centre \( O \) such that \( \angle A P B=50^{\circ} \), then \( \angle O A B \) is equal to
(a) \( 25^{\circ} \)
(b) \( 30^{\circ} \)
(c) \( 40^{\circ} \)
(d) \( 50^{\circ} \)
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