The problem asks for writing an expression based on the following sequence of operations:

1. Triple $n$.
2. Then divide 3 by the result of tripling $n$.

The key points are:

• "Triple $n$" means multiplying $n$ by 3, or $3n$.
• "Divide 3 by the result" means dividing 3 by $3n$.

So the correct expression is:

$\frac{3}{3n}$

Would you like more details, or have any questions?

Here are 5 related questions to expand on this:

1. What does it mean to "double" or "quadruple" a variable in an expression?
2. How do you express "subtracting a number from the result" in algebraic terms?
3. Can you write an expression for halving a number $n$ and then dividing 4 by the result?
4. How would you express dividing 5 by the sum of $n$ and 2?
5. What would the expression be if you had to divide $n$ by the result of tripling 3?

Tip: Always perform operations in the correct order when translating a word problem into an algebraic expression!