The order of the differential equation of all circles of radius r, having centre on y-axis and passing through the origin is

The order of the differential equation of all circles of radius r, hav

1.	The order of the differential equation of all circles of radius r, having centre on y-axis and passing through the origin is
A.	1
B.	2
C.	3
D.	4
Answer» B. 2

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The order of the differential equation of all circles of radius r, having centre on y-axis and passing through the origin is

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