Abstract
The random polyphenyl chains with n hexagons are the special graphs of unbranched polycyclic aromatic hydrocarbons. The Randić (R) index and first Zagreb (M 1) index are two well-studied topological indices and found to be useful tools in QSPR and QSAR investigations. In this paper, we further establish simple explicit formulae for expected values of the Randić and first Zagreb indices in random polyphenyl chains and present the average values of these indices with respect to the set of all polyphenyl chains with n hexagons. Based on these formulae, we make comparisons between expected values of the Randić and first Zagreb indices in random polyphenyl chains.
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