Let veca=hat i-2 hat j+hat k, vecb=hat i...

Let `veca=hat i-2 hat j+hat k, vecb=hat i-hat j+hat k` and `vec c` is nonzero vector and `vecb xx vec c= vec b xx vec a, vec a.vec c=0`. Find `vecb.vec c`.

`1/2`

`1/3`

`-1/2`

`-1/3`

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