the circle whose eq. are x2 +y2 +c2=2ax and x2 +y2 +c2-2by=0 will touch another externally if


a. 1/b2 +1/c2 =1/a2


b. 1/b2 =1/c2 +1/a2


c. 1/a2 +1/b2 =1/c2

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Answers : (3)

                    

Answer is c)

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