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[" 13.The lines "(x-2)/(1)=(y-3)/(1)=(z-...

[" 13.The lines "(x-2)/(1)=(y-3)/(1)=(z-4)/(-k)" and "(x-1)/(k)=(y-4)/(2)=(z-5)/(1)" are "],[" coplanar if "-1" (B) "k=0" or "-3],[[" (Q) "k=1" or "-1," (訪 "],[" (C) "k=3" or "-3," (年) "-1]]

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