Let G be a simple connected graph. The Wiener index of G is equal to the sum of distances between all pairs of vertices of G and terminal Wiener index of G is equal to the sum of distances between all pairs of pendent vertices (vertices of degree one) of G. In this paper we compute the Wiener and terminal Wiener indices of generalized Bethe trees and also for the rooted tree where is obtained by using coalescence of two generalized Bethe trees, at rooted vertices. As a application those topological indices for dendrimer trees is computed.
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