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     EduGorilla 
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    If the equation x2 + 2gx + 2fy + c = 0 represents a circle with x-axis as a diameter and radius a, then

    Options :-

    1. f = 2a, g = 0, c = 3a2
    2. f = 0, g = a, c = 3a2
    3. f = 0, g = – 2a, c = 3a2
    4. none of these
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