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Thread: Finite series

  1. September 15th 2009, 03:19 AM #1
    Sam786
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    Exclamation 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!
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  2. September 15th 2009, 03:55 AM #2
    Taluivren
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    Quote Originally Posted by Sam786 View Post
    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!
    Attached Thumbnails Attached Thumbnails Finite series-gg.jpg  
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  3. September 15th 2009, 05:34 AM #3
    mathaddict
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    Quote Originally Posted by Sam786 View Post
    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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