Help with summation

**coatesdr** · October 5th 2009, 09:28 AM

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

**tonio** · October 6th 2009, 11:30 AM

Originally Posted by coatesdr

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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