$\sum_{i=1}^\infty (1-\alpha)_{(i-1)}*\frac{\varepsilon^i}{i!}$ = $\frac{1-(1-\varepsilon)^{\alpha}}{\alpha}$
where $(1-\alpha)_{(i-1)}$ is the Pochammer symbol or rising\ascending factorial.
Can anyone explain me this equality? Thanks
2026-03-25 23:37:48.1774481868
is there anyone able to develop this series in order to get the following equality?
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