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Question Number 152082 by Tawa11 last updated on 25/Aug/21

Answered by Ar Brandon last updated on 25/Aug/21

$$=\sum _{1⩽\mathrm{r}⩽80}\mathrm{r}=40\left(81\right)=3240$$

Commented by Tawa11 last updated on 26/Aug/21

$$\mathrm{Thanks}\mathrm{sir}.\mathrm{God}\mathrm{bless}\mathrm{you}.$$

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