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The two lines vecr=veca+veclamda(vecbxxv...

The two lines `vecr=veca+veclamda(vecbxxvecc) and vecr=vecb+mu(veccxxveca)` intersect at a point where `veclamda and mu` are scalars then (A) `veca,vecb,vecc` are non coplanar (B) `|veca|=|vecb|=|vecc|` (C) `veca.vecc=vecb.vecc` (D) `lamda(vecb xxvecc)+mu(vecc xxveca)=vecc`

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