If bara,barb,barc are non-coplanar vecto...

If `bara,barb,barc` are non-coplanar vectors, express `bara times (barb times barc)` as a linear combination of `bara,barb,barc`

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IF bara,barb,barc and bard are any four vectors then (bara times barb) times (barc times bard) is a vector

perpendicular to `bara,barb,barc and bard`

along the line of intersection of two planes, one containing `bara,barb` other containing `barc,bard`

equally inclined to both `bara times barb and barc times bard`

None of these

If bara, barb,barc are non-coplanar vectors, then (bara+barb+barc).(bara+barb)xx(bara+barc)=

`[barabarb barc]`

`2[barabarb barc]`

`-[barabarb barc]`

If bara,barb,barc be any three non-coplanar vectors, then [bara+barb" "barb+barc" "barc+bara]=

`[bara" "barb" "barc]`

`2[bara" "barb" "barc]`

`[bara" "barb" "barc]^2`

`2[bara" "barb" "barc]^2`