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Question

The locus of a point, such that the sum of the squares of its distance from the planes x+y+z=0,xz=0 and x2y+z=0 is 9, is

A
x2+y2+z2=3
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B
x2+y2+z2=6
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C
x2+y2+z2=9
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D
x2+y2+z2=12
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Solution

The correct option is D x2+y2+z2=9
Let (a,b,c) be the point satisfy the given condition
(a+b+c)23+(ac)22+(a2b+c)26=9
a2+b2+c2=9
x2+y2+z2=9

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