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If A(4,8,12), B(2,4,6), C(3,5,4) and D(...

If A(4,8,12), B(2,4,6), C(3,5,4) and D(5,8,5) are four points, show that the lines `vec(AB) and vec(CD)` intersect.

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The correct Answer is:
(1,2,3)
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