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Question

Centre of the sphere (x−x1)(x−x2)+(y−y1)(y−y2)+ (z−z1)(z−z2)=0

A
(x1,y1,z1)
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B
(x2,y2, z2)
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C

(x1x22,y1y22,z1z22)

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D

(x1+x22,y1+y22,z1+z22)

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Solution

The correct option is C

(x1+x22,y1+y22,z1+z22)


Given, (xx1)(xx2)+(yy1)(yy2)+(zz1)(zz2)=0
x2+y2+z2(x1+x2)x(y1+y2)y(z1+z2)z+x1x2+y1y2+z1z2=0
Hence centre of the sphere is (x1+x22,y1+y22,z1+z22)

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