1.

If bara,barb barc and bard are non-zero, non-collinear vectors such that bard is perpendicular to bara,barb and barc and (bara.barc)bara=barc then bara.(barb times bard) is equal to

Answer»

`(barc.bard)/|barc|^2`
`|barc|^2`
`(bara.bard|)/|bara|^2`
NONE of these

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