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Find whether the lines vec r=(hati-hatj-...

Find whether the lines `vec r=(hati-hatj-hatk)+lambda(2hati+hatj)` and `vecr=(2hati-hatj)+mu(hati+hatj-hatk)` intersect or not. If intersecting find their point of intersection.

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The correct Answer is:
The lines intersect and point of intersection is (3,0,-1)`.
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