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Let j ˆ i ˆ 3 a + = r and k ˆ j ˆ 2 i ˆ b + + = r . Let c r be a vector satisfying c b ) c b ( a r r r r r λ + = × × . If b r and c r are non-parallel, then the value of λ is :

1. – 5
2. 5
3. 1
4. – 1

Correct answer: – 5

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