COMEDK Exam 2018 Solved Paper

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Question : 147 of 180

Marks: +1, -0

If the circles x2+y2+2gx+2fy=0 and x2+y2+2g′x+2f′y=0 touch each other, then

fg=f′g′
f′g=fg′
ff′=gg′
None of these

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