How to create an Array of math calculation

Hi every body, I intend to use constuct 2 to create some program like this picture below which I have created using Javascript and HTML5.

dl.dropbox.com/u/44238179/Untitled.png

The idea is that, student can choose a math operation in the beginning. After that, 20 questions will be displayed. The question is like 3 x 5, 7 x 5, 2 x 4, etc. One important thing is that, the question must not be similar.

In javascript, i used an array to store the numbers. With some if condition, I can do the above request easily. I have seen that there is Array in Construct 2 as well but I do not know if it is possible to use in this situation or not.

Any idea, please?

Thanks in advance.