A recent question has led to me seeking clarification as to what exactly counts as being 'on topic' for questions asking about probability.

The question I am referring to is [Help Needed With Probability Math for 2d10](https://rpg.stackexchange.com/questions/35643/help-needed-with-probability-math-for-2d10).

The reason for my confusion is that our policy with this type of question seems confused at best, and undefined at worst. For example, [Is 3d6 the same as 1d18?](https://rpg.stackexchange.com/questions/33807/is-3d6-the-same-as-1d18) is another recent question that instead of being closed, received one of the highest vote counts in recent months.

**What are the criteria that define whether a question talking about dice or game statistic probability is on or off-topic?**