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Math Help - Convergence question

  1. #1
    Junior Member
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    Convergence question

    How do I show that SUM n-1Ck-1 converges..and it would also be helpful to show what it converges to. Thanks im a little rusty
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  2. #2
    MHF Contributor
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    Do you mean \sum\binom{n-1}{k-1}? What is the index of summation? What set does it range over? Is this an infinite series?
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