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