For a graph G = (V, E), the modified Schultz index of G is defined as S*(G) = Sigma {u,v} subset of V(G) (d(G)(u).d(G)(v))d(G)(u, v) where d(G)(u) (or d(u)) is the degree of the vertex u in C, and dG (u, v) is the distance between u and v. The first Zagreb index M-1 is equal to the sum of the squares of the degrees of the vertices, and the second Zagreb index M-2 is equal to the sum of the products of the degrees of pairs of adjacent vertices. In this paper, we present a unified approach to investigate the modified Schultz index and Zagreb indices of tricyclic graphs. The tricyclic graph with n vertices having minimum modified Schultz index and maximum Zagreb indices are determined.
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