Q 1134445352.     From a point `P(lambda, lambda,lambda)`, perpendiculars `PQ` and `PR` are drawn respectively on the lines `y = x, z = 1` and `y=-x, z=-1`. If `P` is such that angle `QPR` is a right angle, then the possible value`(s)` of `lambda` is`(are)`

JEE-MIS 2014
A

`-1`

B

`0`

C

`1`

D

`2`

0
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