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The Estrada index of a graph G, introduced by Estrada in 2000, is defined as EE(G)=∑i=1neλi, where λ1,λ2,…,λn are the eigenvalues of a graph G. A cactus graph is a connected graph in which any two simple cycles have at most one vertex in common. In this paper, we investigate cactus graphs in which every block is a triangle. The upper and lower bounds for Estrada index of these cactus graphs are obtained,...
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