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