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Question-152082




Question Number 152082 by Tawa11 last updated on 25/Aug/21
Answered by Ar Brandon last updated on 25/Aug/21
=Σ_(1≤r≤80) r=40(81)=3240
$$=\underset{\mathrm{1}\leqslant\mathrm{r}\leqslant\mathrm{80}} {\sum}\mathrm{r}=\mathrm{40}\left(\mathrm{81}\right)=\mathrm{3240} \\ $$
Commented by Tawa11 last updated on 26/Aug/21
Thanks sir. God bless you.
$$\mathrm{Thanks}\:\mathrm{sir}.\:\mathrm{God}\:\mathrm{bless}\:\mathrm{you}. \\ $$

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