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If the lines `(x-1)/(-3)=(y-2)/(2k)=(z-3)/(-2)a n d(x-1)/(3k)=(y-5)/1=(z-6)/(-5)` are at right angel, then find the value of `kdot`

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If the lines `(x-1)/(-3)=(y-2)/(2k)=(z-3)/(-2)a n d(x-1)/(3k)=(y-5)/1=(z-6)/(-5)` are at right angel, then find the value of `kdot`
A. `-10`
B. `-7/10`
C. `-10/7`
D. `10/7`
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Correct Answer - C
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