philosphy
2014
You may have learnt the formula in school: $\\\\sum\\\\limits\{r=1}^n r = \\\\frac{(n+1)(n)}{2}$ $n$ here is the last value in the series to be added up. $a$ is…
You may have learnt the formula in school: $\\\\sum\\\\limits\{r=1}^n r = \\\\frac{(n+1)(n)}{2}$ $n$ here is the last value in the series to be added up. $a$ is…