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If the vectors k ˆ 4 j ˆ i ˆ a       , k ˆ 2 j ˆ 4 i ˆ 2 b      and k ˆ j ˆ 3 i ˆ 2 c     are coplanar and the pr ojection of a  on the vector b  is 54 units, then the sum of all possible values of  +  is equal to

1. 24
2. 0
3. 6
4. 18

Correct answer: 24

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