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[" 4.From a point "P(lambda,lambda,lambd...

[" 4.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 "/_QPR" is a right angle,then the possible value(s) "],[" of "lambda" is/are "],[[" (a) "2," (b) "1," (c) "-1," (d) "-sqrt(2)]]

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