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Which of the following are concentric circle
Option: 1
$x^2+y^2=4\;\;\text{and}\;\;x^2+y^2=16$

Option: 2
$x^2+y^2+4x+10\;\;\text{and}\;\;\;x^2+y^2+4x+20=0$

Option: 3
$x^2+y^2+6y+10\;\;\text{and}\;\;\;x^2+y^2+6y-20=0$

Option: 4
All of the above

Answers (1)

best_answer

All the option are correct.

Posted by

sudhir.kumar

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