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Easy

Question

a with ‾ on top equals i with ‾ on top plus j with ‾ on top plus k with ‾ on top comma b with ‾ on top equals i with ‾ on top minus j with ‾ on top plus k with ‾ on top and c with ‾ on top equals i with ‾ on top minus j with ‾ on top minus k with ‾ on top be the three vectors A vector stack v with ‾ on top in the plane of stack a with ‾ on top & stack b with ‾ on top whose projection of stack c with ‾ on top is fraction numerator 1 over denominator square root of 3 end fraction is given by

  1. i with ‾ on top minus 3 j with ‾ on top plus 3 k with ‾ on top    
  2. negative 3 i with ‾ on top minus 3 j with ‾ on top minus k with ‾ on top    
  3. 3 i with ‾ on top minus j with ‾ on top plus 3 k with ‾ on top    
  4. i with ‾ on top plus 3 j with ‾ on top minus 3 k with ‾ on top    

The correct answer is: 3 i with ‾ on top minus j with ‾ on top plus 3 k with ‾ on top

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