If veca, vecb and vecc are unit coplanar...

If `veca, vecb and vecc` are unit coplanar vectors , then the scalar triple porduct `[2 veca -vecb" " 2vecb - vecc " "2vecc-veca] `is

`-sqrt3`

`sqrt3`

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The correct Answer is:

`veca vecb and vecc` are unit coplanar vectors, `2veca- vecb , 2vecb - 2vecc and 2vecc - veca` are also coplanar, vectors ], being a linear combination of `veca , vecb and vecc` thus ` [ 2 veca - vecb 2vecb - vecc 2vecc - veca] =0`

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