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If the solution of the differential equation dy/dx = (ax + 3)/(2y + f) represents a circle, then the value of a is ... (a) 2 (b) -2 (c) 1

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If the solution of the differential equation dy/dx = (ax + 3)/(2y + f) represents a circle, then the value of a is ...

(a) 2 

(b) -2 

(c) 1 

(d) -1

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Answer is (b) -2

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