1.

Let bara =bari+2barj+bark, barb=bari-barj+bark, barc=bari+barj-bark. A vector coplanar to bara and barb " has a projection along " barc " of magnitude " 1/sqrt3, then the vector is

Answer»

`4bari-barj+4bark, 2bari+barj+2bark`
`bari+barj-4bark, bari+2barj-bark`
`4bari-barj+4bark, 2bari+barj+2bark`
`2bari-barj+2bark, bari2barj-bark`

ANSWER :A


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