Question

find the sum of 25 cubes starting from one with formula

Answer 1

$s \frac{}{n} = \frac{ {n}^{2} {(n + 1)}^{2} }{4}$
$s\frac{}{25}=\frac{{(25)}^{2}{(26)}^{2}}{4}$
$s\frac{}{25}=\frac{625×169}{4}$
$s\frac{}{25}=105625$