Hello,

I am using following latex lines to produce my output:

\begin{equation}

U=\frac{ \sum_{F=1}^{N_F}N_S^{(F)} }{N_S \times N_F}

\label{AvgU}

\end{equation}

The problem is that I am getting an output (attached) in which limits of summation are to the right and not exactly above or below. They are all right in equation mode when there is no fraction. I need to number this equation as well. Can I anyone tell me how to get the limits of summation above and below in the above mentioned example keeping in consideration that I have to number the equation as well.

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