Abstract
In terms of the hypergeometric method, we establish the extension of a series for 1/π due to Ramanujan [Modular equations and approximations to π. Quart J Math (Oxford). 1914;45:350–372] with two free parameters and a beautiful series for π with one free parameter. Meanwhile, two series for 1/π with three free parameters are also derived in the same way.
Published Version
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