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• 17:59, 18 October 2023 Nagy Lenard talk contribs created page Gazeta Matematică nr 27020 2015 (Pagină nouă: '''27020 (Gheorghe Szöllösy)''' Să se calculeze suma <math> \sum_{k=0}^{\left[\frac{n}{2}\right]} \frac{1}{4^k \cdot (k!)^2 (n-2k)!}, \quad n \geq 1 </math>)