Locating missing sequential numbers can be an arduous task when working with long lists of data. For example, you might want to locate business check numbers that haven't been logged into a balance ...

First find the common difference between each term and the next. In this case, every time you move along one position (n + 1), the term goes up by three (s + 3). This is three times as much and this ...

You get the next term by adding three to the previous term. The rule is + 3. So you can find any term if you know the previous term. But how do you find the term for any position without working out ...