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Let k ˆ 4 j ˆ 2 i ˆ a + + = G , k ˆ 4 j ˆ i ˆ b + λ + = G and k ˆ ) 1 ( j ˆ 4 i ˆ 2 c 2 − λ + + = G be coplanar vectors. Then the non-zero vector c a G G × is :

1. j ˆ 5 i ˆ 10 − −
2. j ˆ 5 i ˆ 10 + −
3. j ˆ 5 i ˆ 14 + −
4. j ˆ 5 i ˆ 14 − −

Correct answer: j ˆ 5 i ˆ 10 + −

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