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Questions  

A circle is described on the line joining the points  (2,3)  and  (4,7)  as a diameter 

a
passes through the origin
b
touches the axis of x.
c
touches the axis of y
d
origin lies inside the circle

detailed solution

Correct option is D

Equation of the circle is  (x−2)(x+4)+(y+3)(y−7)=0⇒x2+y2+2x−4y−29=0Centre is (1, – 2), radius   =34Distance of the centre from the origin is 5<34

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