New answers tagged size
0
I show your original, followed by two alternatives. The first scales the summation to 20% of the original size. The second scales the 3 to 500% of the original size. The \scaleobj command is part of the scalerel package. It is similar to the \scalebox command of the graphicx package, except that it defaults to math mode, and takes the current math style ...
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You could use parentheses to make more clear what you would like to show:
3^{\left (\displaystyle \sum_{n=0}^{\infty}\frac{(-1)^n}{2^n} \right)}
Or standard in-line style:
3^{\left (\sum_{n=0}^{\infty}\frac{(-1)^n}{2^n}\right )}
or even
3^{\sum_{n=0}^{\infty}\frac{(-1)^n}{2^n}}
This looks much more natural than having a huge 3 and a tiny ...
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