MathematicsMedium249×since 2002Q2478If the straight lines x=1+s,y=−3x=1+s,y=-3x=1+s,y=−3−λs,- \lambda s,−λs, z=1+λsz = 1 + \lambda sz=1+λs and x=t2,y=1+t,z=2−t,x = {t \over 2},y = 1 + t,z = 2 - t,x=2t,y=1+t,z=2−t, with parameters sss and ttt respectively, are co-planar, then λ\lambdaλ equals :A000B−1-1−1C−12- {1 \over 2}−21D−2-2−2Check answerSkip