1. ## Finite series

Hi I'm realy stuk!! Please elp me!!

I ave 2 find the sum of series

11^3 + 12^3 + 13^3 + ......+ 20^3

2. Originally Posted by Sam786
Hi I'm realy stuk!! Please elp me!!

I ave 2 find the sum of series

11^3 + 12^3 + 13^3 + ......+ 20^3

3. Originally Posted by Sam786
Hi I'm realy stuk!! Please elp me!!

I ave 2 find the sum of series

11^3 + 12^3 + 13^3 + ......+ 20^3

Hi

OR you can use the summation formulas ..

$\sum^{20}_{r=1}r^3-\sum^{10}_{r=1}r^3$