Abstract :
Let G1+G2, G1∇G2, G1[G2], G1∘G2 and G1{G2} be the sum, join, composition, corona and cluster, respectively, of the graphs G1 and G2. Elsewhere, Yeh and Gutman computed the Wiener number of these composite graphs. In this paper, we generalize their results to compute the Hosoya polynomial of these graphs.