If vec a and vec b are two collinear vec...

If `vec a and vec b` are two collinear vectors then which of the following are incorrect :

`vecb = lambdaveca, for some scalar lambda`

`veca = +-vecb`

the respective components of `veca and vecb` are proportional.

both the vectors `veca and vecb` have same direction, but different magnitudes.

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