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Math Help - Help with summation

  1. #1
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    Help with summation

    Hi, I need some help with summation, I'm missing it in class today because I'm sick. The question I'm working on is:

    Evaluate \sum\left(\begin{array}{cc}n\\i\end{array}\right)*  \frac{1}{2^n}.

    If \sum\left(\begin{array}{cc}n\\i\end{array}\right)=  2^n

    would that mean \sum\left(\begin{array}{cc}n\\i\end{array}\right)*  \frac{1}{2^n}=\sum 1=n?
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  2. #2
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    Quote Originally Posted by coatesdr View Post
    Hi, I need some help with summation, I'm missing it in class today because I'm sick. The question I'm working on is:

    Evaluate \sum\left(\begin{array}{cc}n\\i\end{array}\right)*  \frac{1}{2^n}.

    If \sum\left(\begin{array}{cc}n\\i\end{array}\right)=  2^n

    would that mean \sum\left(\begin{array}{cc}n\\i\end{array}\right)*  \frac{1}{2^n}=\sum 1=n?

    Correct

    Tonio
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