Question: Explain why each of the following polynomials in cannot be a chromatic polynomial. (a) 4 - 53 + 72 - 6 + 3 (b)

Explain why each of the following polynomials in λ cannot be a chromatic polynomial.
(a) λ4 - 5λ3 + 7λ2 - 6λ + 3
(b) 3λ3 - 4λ2 + λ
(c) λ4 - 3λ3 + 5λ2 - 4λ

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