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FP1 series question HELP!!!! watch

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    Identity 1/r(r+1)=1/r - 1/r+1 series n (sigma)r=1 1/r(r+1)

    Help i have no idea how to do this!!!
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    Substitute the identity into the series, then start writing out some terms of it. What do you notice happens?
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    I hate the seires questions in FP1 When i try writing out the terms I never know when to add them or just leave them alone:confused: I normally end up with stupid answers such as 15=15 which doesn't help.
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    (Original post by FWoodhouse)
    Substitute the identity into the series, then start writing out some terms of it. What do you notice happens?
    :ditto:
    Spoiler:
    Show
    I call it "the Method of Cancellation".
 
 
 
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Updated: July 6, 2006

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