If vec a , vec b ,a n d vec c are three...

If ` vec a , vec b ,a n d vec c` are three mutually orthogonal unit vectors, then the triple product`[ vec a+ vec b+ vec c vec a+ vec b vec b+ vec c]` equals `0` b. `1or-1` c. `1` d. 3

`0`

`1`

`-1`

`3`

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