1. ## Latex help

How do i write these in latex :

the bigger version of this : [ ] , ( )

$\displaystyle \frac{1}{3}$

What's wrong with this ?

$\displaystyle \frac{1}{3}$
$\displaystyle {\color{red}\left(\frac{1}{3}\right)}?$
$${\color{red}\left(\frac{1}{3}\right)}$$