∑ Formula
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![Solved The formula:1(1-x)n=∑k=0∞([n+k-1],[k])xk.Exercie: | Chegg.com](https://media.cheggcdn.com/media/c84/c844ac2e-e928-449d-831c-e580899e9720/Screenshot2023-11-13at2.10.07pm.png)










































