Let G(V,E) be a simple molecular graph, for a graph G(V,E) with vertex(atom) set V and the edge(bond) set E, the third version of atom bond connectivity index is defined as ABC_3(G), where m_v is the number of edges of G lying near to u than to v. In this research paper, we compute the third version of atomic-bond connectivity index of the Titania Nanotubes TiO_2 (m,n)
