Q 2147234183.     A plane P passes through the line of intersection of the planes
`2x- y + 3z = 2 , x + y - z = 1` and the point `(1, 0, 1).`

If the plane `P` touches the sphere `x^( 2) + y^(2) + z^(2) = r^( 2)` ,then
what is requal to?

NDA 2016 Paper 1 April
A

` 2/sqrt(29)`

B

` 4/sqrt(29)`

C

` 5/sqrt(29)`

D

`1`

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