What comes next in the sequence?
$$\text{A, C, E, G, \_\_\_\_}$$

Let's find the standard alphabetical positional values of the given letters:
* $\text{A}=1$
* $\text{C}=3$
* $\text{E}=5$
* $\text{G}=7$

The positions are increasing by $+2$ at each step:

* $1+2=3$
* $3+2=5$
* $5+2=7$

Following the same pattern, the next positional value will be:

$$7+2=9$$

The letter at the $9\text{th}$ position in the English alphabet is $\text{I}$.