1.

The locus of the point, the sum of the squares of whose distance from the planes x+y+z=0, x-y=0,x+y-2z=0 is 7 is

Answer»

`X^(2)+y^(2)+z^(2)=7`
`x^(2)+y^(2)+z^(2)=5`
`x+y+z=sqrt(5)`
`x^(2)+y^(2)+z^(2)=25`

Answer :A


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