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In each paragraph 2 multiple choice questions have to be answered. Each question has four choices (A), (B), (C) and (D) out of which ONLY ONE is correct.
A tangent PT is drawn to the circle x2+y2=4 at the point A straight line L, perpendicular to PT is a tangent to the circle (x−3)2 + y2=1.
A common tangent of the two circles is