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A,B,C and D are 4 points on the circumfe...

A,B,C and D are 4 points on the circumference of the circle and O is the centre of circle `angle OBD - angle CBD = angle BDC - angle ODB` find `angle A `

A

`60^@`

B

`50^@`

C

`72^@`

D

`120^@`

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