Centre of the sphere which touches the lines `y = x , z = c` and `y = - x , z = - c` lies on

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Q 1257101984.     Centre of the sphere which touches the lines `y = x , z = c` and `y = - x , z = - c` lies on
A

`yz + 2cx = 0`

B

None of these

C

`xy + 2cz = 0`

D

`zx + 2cy = 0`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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