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Binomial Coefficient problem

  1. Jan 14, 2005 #1
    I'm working on an IB mathematics portfolio, and here's a problem I don't understand:
    It's not specified what [itex]a[/itex] and [itex]b[/itex] is supposed to represent. That's where I need some explanation.
    I already made a nice Pascal triangle all the way to the 10th row.
    All help is appreciated.
  2. jcsd
  3. Jan 14, 2005 #2


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    My guess is that it comes from the expansion:

    [tex] (a+b)^{n}=\sum_{k=0}^{n}C_{n}^{k} a^{n-k}b^{k} [/tex]


    PS.Can u handle the [itex] (n-1) [/itex] term part??
  4. Jan 14, 2005 #3
    Thanks, I'll give it a try
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