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Find points A,B where A lies on a line t...

Find points A,B where A lies on a line through (6,7,4) with d.rs 3,-1,1 and B lies on a line through (0,-9,2) with d.rs -3,2,4 such that AB is perpendicular to both lines.

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The correct Answer is:
A(3,8,3) and B(-3,-7,6)
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