if \( P Q R \) is the tangent to a circle at \( Q \) whose centre i...

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if \( P Q R \) is the tangent to a circle at \( Q \) whose centre is \( 0, A B \) is a chord
(VI) parallel to \( P R \) and \( \angle B Q R=70^{\circ} \), then \( \angle A Q B \) is equal to
(a) \( 20^{\circ} \)
(b) \( 40^{\circ} \)
(c) \( 35^{\circ} \)
(d) \( 45^{\circ} \)
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