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I need to prove that: $$ \sum_{i = 0}^n ~ i ~ {n \choose i} = n ~ 2^{n-1} $$

Been stuck for a while now, will appreciate any help.

Thanks in advance.

Christian E. Ramirez
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Garry
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    Welcome to MSE. Your question is phrased as an isolated problem, without any further information or context. This does not match many users' quality standards, so it may attract downvotes, or closed. To prevent that, please [edit] the question. This will help you recognise and resolve the issues. Concretely: please provide context, and include your work and thoughts on the problem. These changes can help in formulating more appropriate answers. – José Carlos Santos Jan 27 '23 at 10:44
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    Try induction ! – xyz Jan 27 '23 at 10:45

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