Superscript on top and subscript on bottom in equation

Question

\documentclass[12pt]{article}
\usepackage{amsthm}
\usepackage{amsmath}
\usepackage{graphicx}
\usepackage{hyperref}
\usepackage[latin1]{inputenc}

\begin{document}

\begin{equation}
u_{k}^{i} = \frac{\sqrt[k]{\Pi_{j=1}^{k}a_{ij}}}{\sum_{i=1}^{k}\sqrt[k]{\Pi_{j=1}^{k}a_{ij}}}
\end{equation}

\end{document}

The result I get is this

what I want is this

somehow inside equation, the subscript & superscript positioned at the side not on top and bottom as I wanted them. How can I do that?

Answer 1

Use \sum\limits instead of \sum and \prod\limits instead of \Pi.

\documentclass{article}
\begin{document}
\begin{equation}
u_{k}^{i} = 
\frac
{\sqrt[k]{\prod\limits_{j=1}^{k}a_{ij}}}
{\sum\limits_{i=1}^{k}\sqrt[k]{\prod\limits_{j=1}^{k}a_{ij}}}
\end{equation}
\end{document}