In the given figure (not to scale), the points \( M, R \), W \( N, S \) and \( Q \) are concycli...

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In the given figure (not to scale), the points \( M, R \),
W \( N, S \) and \( Q \) are concyclic. Find \( \angle P Q R+\angle O P R \) \( +\angle N M S+\angle O S N \), if \( O \) is the centre of the circle.
(a) \( 90^{\circ} \)
(b) \( 180^{\circ} \)
(c) \( 270^{\circ} \)
(d) Data inadequate
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