1.

If bara, barb, barc, bard are any four vectors then (baraxx barb) xx (barc xx bard) is a vector

Answer»

`bot` to `BARA,barb,barc,BARD`
equally inclined to `baraxxbarb` and `barcxxbard`
ALONG the LINE of intersection of two planes, one containing `bara, barb` and the other containing `barc, bard`
2 and 3

Answer :D


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