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I am new to LaTex, I am using a Overleaf. I'm trying to write the equation

n\times b= b+b+...+b 

with 'n-times' in the bottom.

  • Off-topic: There's no need for the hyphen character between "n" and "times". Just write n \text{times} and you'll be fine. – Mico Apr 20 at 16:23
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    Doesn't merely "n" suffice? – GermanShepherd Apr 20 at 16:25
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Like this?

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{equation}
    n\times b=\underbrace{b+b+\cdots+b}_{n\textup{-times}}
\end{equation}
\end{document}

You might replace \cdots with \ldots. See also When to use \dots, \ldots, \cdots, and blanks? and \dots versus \ldots - is there a difference?. Please read Mico's comment.

enter image description here

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    @JouleV I am sorry, I do not see that \cdots does not correspond to the posted image. – CampanIgnis Apr 20 at 16:26
0

Is this what you are asking for?

\usepackage{amsmath}
\begin{document}
\begin{equation}
$n \times b=\underbrace{b+b+\ldots+b}_{n}$
\end{equation}
\end{document}

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