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[" 12.If the straight lines "x=1+s,y=-3-...

[" 12.If the straight lines "x=1+s,y=-3-lambda s,z=1+lambda" sand "quad z=1" and "x+3" ,"],[x=(t)/(2),y=1+t,z=2-t" with parameters "s" and "t,],[" respectively,are coplanar,then "lambda" equals "],[[" (c) "2," (b) "-1," (c) "-1/2," (d) "0]]

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