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Question Number 86140 by Wepa last updated on 27/Mar/20

Commented by Prithwish Sen 1 last updated on 27/Mar/20

$${\left(\frac{1}{2}\right)}^{2020}\underset{\mathbf{k}=2}{\mathbf{\sum }^{2020}\mathrm{k}}.2^{\mathbf{k}}\mathbf{please}\mathbf{check}.$$

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