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The order of the differential equation of all circles whose radius is 4, is ...... .

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The order of the differential equation of all circles whose radius is 4, is ...... .
A. 1
B. 2
C. 3
D. 4
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Correct Answer - B
Let equation of all circles having centre (a,b) and given radius is 4, is
`(x-a)^(2)+(y-b)^(2)=4`
Here, number of arbitary constant in two (a,b) so its order is 2.
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