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The aim of this paper is to prove the irrationality of a certain class of infinite series. The main theorem is related to some results due to Erdos and Straus , Erdos  and S6ndor  . As applications of the main result, the solutions of two problems posed by Erdos and Graham  are given, among others.doi:10.1017/s0017089500006868 fatcat:payhy5ohjnegbn7th4rszs4sya