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** Q 1657145084. ** From a point `P(\lambda, \lambda, \lambda)`, perpendicular `PQ` and `PR` are drawn respectively on the lines `y = x, z =1` and `y = -x, z= -1`. If `P` is such that `\angleQPR` is a right angle, then the possible value(s) of `\lambda` is(are)

**JEE 2014 ADVANCED Paper - 1**