What is the chromatic polynomial P(C3,k)P(C_3, k)P(C3,k) for the cycle graph C3C_3C3?
k(k−1)k(k-1)k(k−1)
k(k−1)(k−2)k(k-1)(k-2)k(k−1)(k−2)
k3−3k2+3kk^3 - 3k^2 + 3kk3−3k2+3k
k(k−1)2k(k-1)^2k(k−1)2