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Write the condition for the lines vec(r)...

Write the condition for the lines `vec(r) = vec(a)_(1) + lambda vec(b)_(1)`  and  `vec(r) = vec(a)_(2) + lambda vec(b)_(2)` be intersecting.

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The correct Answer is:
`(vec(b)_(1) xx vec(b)_(2)).(vec(a)_(2) - vec(a)_(1)) = 0`
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ARIHANT PUBLICATION-THREE-DIMENSIONAL GEOMETRY-Chapter Practice
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