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The condition for the coaxial system $x^2+y^2+2 \lambda x +c=0,$ where $\lambda$ is a parameter and c is a constant to have distinct limiting points, is

\[\begin {array} {1 1} (a)\;c=0 & \quad (b)\;c < 0 \\ (c)\;c=-1 & \quad (d)\; c > 0 \end {array}\]

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(d) c > 0 is the correct answer.
answered Nov 7, 2013 by pady_1
edited Jan 20, 2014 by meena.p