Finite series

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September 15th 2009, 03:19 AM
Sam786

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

I dunt gt hw 2 do it?? Please help!
September 15th 2009, 03:55 AM
Taluivren

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Quote:

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

I dunt gt hw 2 do it?? Please help!

(Rofl)
September 15th 2009, 05:34 AM
mathaddict

Quote:

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

I dunt gt hw 2 do it?? Please help!

Hi

OR you can use the summation formulas ..

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

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