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If the lines (x-1)/(-3)=(y-2)/(2k)=(z-3)...

If the lines `(x-1)/(-3)=(y-2)/(2k)=(z-3)/(2)` and `(x-1)/(3k)=(y-1)/(1)=(z-6)/(-5)` are perpendicular, find the value of k.

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The correct Answer is:
`(-10)/(7)`
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