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From a point P(lambda, lambda, lambda), ...

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 tthat `angleQPR` is a right angle , then the possible value(s) of `lambda` is (are)

A

`sqrt2`

B

1

C

`-1`

D

`-sqrt2`

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The correct Answer is:
C
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