[thedufer]

It does not state whether all 250 items must have unique codes. It also is not clear whether, in the questions, the guest chooses a random code (unlikely), a known item, or an item that is marked as being on the menu.

The second question is very misleading, because the answer is obvious without any math at all, which led me to believe I had misinterpreted the problem completely.

Finally, when you call something a grid, I expect it to be 2-dimensional, and without a picture this is the image that stuck. It took me longer than it should have just to grok this basic premise of the problem.

Addendum: it is also not clear whether the five items must be five distinct items, i.e. drawing with vs. without replacement.

On a related note, pages with no title and no favicon give a feeling of illegitimacy. This also added to my overall poor impression of this startup.