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The values of α , for which 0 1 3 3 2 3 1 3 1 1 2 3 2 3 1 + α + α + α + α = 0, lie in the interval

1. (–2, 1)
2. (0, 3)
3. (–3, 0)
4. ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − 2 3 , 2 3

Correct answer: (–3, 0)

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