Simple pendulum problem - confirmation

[Elysium]

Hi, I got this question:

If a simple pendulum with length 1.50 m makes 72.0 oscillations in 180 s, what is the acceleration of gravity at its location?

Ok, for the period:

$$\frac{180\textit{s}}{72.0} = 2.50{\textit{s}}$$

Then I found the pendulum equation that I don't understand well. I arraganged it to find the gravity:

$$g = \left( \frac{2\pi\sqrt{\ell}}{T} \right) ^2$$

Then I plugged in the numbers and got the answer. Did I do this correctly?

 

[mezarashi]

Looks fine =)

But do feel free to clarify your doubts with the pendulum equation if you have any ^^