How do I create conditional checkboxes in Numbers?

In Numbers I want to have three check boxes where:

• if you check box one then box one is checked
• if you check box 2, then both box one and box 2 are checked
• if you check box 3 than all boxes 1-3 are checked

I am having a hard time for the syntax of the IF,Than formula.

Any help would be most appreciated.

[Re-Titled by Moderator]

Original Title: Numbers, Checkboxes, and Forumlas