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The shortest distance between the lines ...

The shortest distance between the lines `vecr-veca+kvecb and vecr=veca+lvecc ` is (`vecb and vecc` are non collinear) (A) 0 (B) `|vecb.vecc|` (C) `(|vecbxxvecc|)/(|veca|)` (D) `(|vecb.vecc|)/(|veca|)`

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