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AB is a chord of a circle (centre o) and...

AB is a chord of a circle (centre o) and DOC is a line segment originating from a point D on the Circle and intersecting AB on Producing at C such that BC = OD. If `angle BCD = 20^(@)`, then `angle AOD` :-

A

`30^(@)`

B

`40^(@)`

C

`10^(@)`

D

`60^(@)`

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