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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-5)/1=(z-6)/(-5)` are at right angle, then find the value of `k`.

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