If `vecx,veca,vecb` and `vecc` are non-zero vectors such that `vecavecx=0,vecbvecx=0` and `vecc*vecx=0` then , `[veca vecb vecc]` is:

If `vecx,veca,vecb` and `vecc` are non-zero vectors such that `veca*vecx=0,vecb*vecx=0` and `vecc*vecx=0` then , `[veca vecb vecc]` is:

none of these

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`vecx` is perpendicular to `veca,vecb` and `vecc` it means `veca,vecb` and `vecc` are coplanar so `[veca vecb vecc]`=0