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Q.

 The circle passing through the intersection of the circles, x2+y2-6x=0 and x2+y2-4y=0 , 

 having its centre on the line, 2x-3y+12=0, also passes through the point: 

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a

1,3

b

3,6

c

3,1

d

1,3

answer is B.

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Detailed Solution

x2+y2-6x=0x2+y2-4y=0

Equation of any circle passing through the points of intersection of the above two circles is

x2+y2-6x+λx2+y2-4y=0 Its centre 31+λ,2λ1+λ

 It lies on 2x-3y+12=0 61+λ-6λ1+λ+12=06-6λ+12+12λ=0,  6λ=-18λ=-3x2+y2-6x-3x2+y2-4y=0-2x2-2y2-6x+12y=0x2+y2+3x-6y=0 It passes through  (by substituting the options ), required point is (-3,6) 

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