Mathematics Vector Algebra

If a̅ + lb̅ + l2 c̅ = \(\bar{ 0 }\) and a̅ × b̅ + b̅ × c̅ + c̅ × a̅ = 3(b̅ × c̅), then the minimum value of such l is  

1
1
2
-2
3
\(\frac{-9}{4}\)
4
0

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