Didn¡¯t realize it was on one of the current exams so I wont provide a specific answer but to add on to Brendon¡¯s answer ¡ it will be way simpler than you might think if you¡¯re using the right symbol¡
This is a question that gets asked quite a bit, as it¡¯s a requirement for the 201 exam. All I can tell you is read the help files. F1 is your best friend.