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Let b , a and c be three unit vectors such that 0 c b a = + + . If λ = a . c c . b b . a + + and a c c b b a d × + × + × = , then the ordered pair, ) d , ( λ is equal to:

1. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × − b c 3 , 2 3
2. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × − b a 3 , 2 3
3. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × c b 3 , 2 3
4. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × c a 3 , 2 3

Correct answer: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ × − b a 3 , 2 3

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