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[" 13.If the lines "(x-1)/(-3)=(y-2)/(2k...

[" 13.If the lines "(x-1)/(-3)=(y-2)/(2k)=(z-3)/(2)" and "(x-1)/(3k)=(y-1)/(1)=(z-6)/(-5)" are perpendicular to each other "],[" then "k=],[[" (a) "(-5)/(7)," (b) "(5)/(7),1," (c) "(10)/(7)," (c) ")quad (-10)/(7)]]

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