UPSC NDA Math Model Paper 7

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Question : 34 of 120

Marks: +1, -0

The differential equation of system of concentric circles with centre (1, 2) is -

(x−2)+(y−1)
dy
dx
=0
(x−1)+(y−2)
dy
dx
=0
(x−1)
dy
dx
+(y−2)=0
(x−2)
dy
dx
+(y−1)=0

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