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The centre of the circle which passes th...

The centre of the circle which passes through points A, B and C is 'O'. If `angleBAO=30^(@), angleBCO=40^(@) and angleAOC=x^(@)`. Then find the value of x.

A

a)`70^(@)`

B

b)`140^(@)`

C

c)`210^(@)`

D

d)`280^(@)`

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