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In the given figure (not to scale ) , O is the centre of the circle . A ,B,C and D are conyclic and AB =CD . If `angleMON=120^(@)` , then find `angleOPN` .

A

`20^(@)`

B

`30^(@)`

C

`40^(@)`

D

`60^(@)`

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The correct Answer is:
B
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