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Question Number 153657 by talminator2856791 last updated on 09/Sep/21

$$$$$$\mathrm{let}d\left(n\right)\mathrm{denote}\mathrm{the}\mathrm{sum}\mathrm{of}\mathrm{the}\mathrm{digits}$$$$\mathrm{of}n.$$$$\mathrm{i}.\mathrm{e}d\left(1000\right)=1,d\left(999\right)=27$$$$$$$$\mathrm{find}\mathrm{minimum}k\mathrm{such}\mathrm{that}$$$$\text{Extra left or missing right}$$$$$$

Commented by Rasheed.Sindhi last updated on 09/Sep/21

$$k=3$$

Commented by talminator2856791 last updated on 09/Sep/21

$$\mathrm{wheres}\mathrm{the}\mathrm{proof}?$$

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