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The sum of the distinct real values of μ , for which the vectors, , k ˆ j ˆ i ˆ + + μ , k ˆ j ˆ i ˆ + μ + k ˆ j ˆ i ˆ μ + + are co-planar, is :

1. 2
2. –1
3. 0
4. 1

Correct answer: –1

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