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[" 31.Find the value of "lambda" ,so tha...

[" 31.Find the value of "lambda" ,so that the lines "(1-x)/(3)=(7y-14)/(lambda)=(z-3)/(2)" and "(7-7x)/(3 lambda)=(y-5)/(1)=(6-z)/(5)" are at right "],[" angles.Also,find whether the lines are intersecting or not."]

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Find the values p so that line (1-x)/(3)=(7y-14)/(2p)=(z-3)/(2) and (7-7x)/(3p)=(y-5)/(1)=(6-z)/(5) are at right angles.