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Find the value of lamda of the following...

Find the value of `lamda` of the following pair of lines are perpendicular to each other
`(1-x)/(3)=(y-2)/(2lamda)=(z-3)/(2)` and `(x-1)/(3lamda)=(y-1)/(1)=(6-z)/(7)`

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The correct Answer is:
`lamda=-2`
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