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Assertion (A): TA and TB are two tangents drawn from an external point T to a circle with centre 'O'. If $\angle TBA = 75^\circ$ then $\angle ABO = 25^\circ$.
Reason (R): The tangent drawn at any point of a circle is perpendicular to the radius through the point of contact.
Reason (R): The tangent drawn at any point of a circle is perpendicular to the radius through the point of contact.
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(D) Assertion (A) is not true but Reason (R) is true.