1.

Lines vecr=veca_1+tvecb_1 and vecr=veca_2+svecb_2 are parallel iff:

Answer»

`vecb_1=lambdavecb_2` for some REAL `LAMBDA`
`vecb_2` is PARALLEL to `veca_2-veca_1`
`vecb_1` is parallel to `veca_2-veca_1`
NONE of these

ANSWER :A


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