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Let vec a= hat j- hat k and vec c= hat...

Let ` vec a= hat j- hat k` and ` vec c= hat i- hat j- hat k` . Then vector ` vec b` satisfying ` vec axx vec b+ vec c= vec0` and ` vec adot vec b=3` is (1) `2 vec i- vec j+2 vec k` (2) ` hat i- hat j-2 hat k` (3) ` hat i+j-2 hat k` (4) `- hat i+ hat j-2 hat k`

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