
Recently Lavoie, Grondin and Rathie obtained ten results closely related to the classical Kummer's theorem as special cases from generalized Whipple's theorem on the sum of a ${}_3F_2$ with unit argument. The aim of this paper is to provide general summation formulas contiguous to the Kummer's theorem by simply using a known integral representation of ${}_2F_1$. As by-product, two classes of summation formulas closely related to the Kummer's theorem were obtained. Some simplified special cases were also given for later easy use.
33C60, generalized Whipple's summation theorem for ${}_3F_2$, hypergeometric series ${}_2F_1$, Kummer's summation formula for ${}_2F_1$, 33C70, 33C05, 33C65
33C60, generalized Whipple's summation theorem for ${}_3F_2$, hypergeometric series ${}_2F_1$, Kummer's summation formula for ${}_2F_1$, 33C70, 33C05, 33C65
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