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     EduGorilla 
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    If the equation
    (x  a)2 + (y  b)2 = c2 + d2 represents a circle, then

    Options :-

    1. a  =  b  =  0
    2. c  <  0,  d  >  0
    3. c  >  0,  d  <  0
    4. c2 + d2 > 0
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Reply To: If the equation(x – a)2 + (y – b)2 = c2 + d2 represents a circle, then….
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