1. ## n

I apologize for the title. This is my first post. If there is a way to change it, I can't find it.

Solve for n

$S_n=n(\frac {a_1+a_n}{2})$

2. ## Re: n

fyi, using tex tags results in ...

$\displaystyle \dfrac{3}{4}$

using dollar sign delimiters works ok ...

\$\dfrac{3}{4}\$ results in ...

$\dfrac{3}{4}$

3. ## Re: n

thank you! sorry, this is my first post.

4. ## Re: n

How were you able to type that code without it actually showing up as the fraction?

5. ## Re: n

Originally Posted by jschoeppler
I apologize for the title. This is my first post. If there is a way to change it, I can't find it.
Solve for n
$S_n=n(\frac {a_1+a_n}{2})$
\begin{align*}S_n&=n\left(\dfrac{a_1+a_n}{2}\right ) \\2S_n&=n(a_1+a)\\n&=\dfrac{2S_n}{(a_1+a_n)} \end{align*}

6. ## Re: n

You used to be able to post math formulas here using "[ math ]" and "[ /math ]". Now, apparently, you have to use "$" and "$" to set apart Latex.

$\displaystyle \sqrt{\frac{a}{b}}$

$\sqrt{\frac{a}{b}}$