Help needed related python ! Thanx

Describe the following mathematically (set up a formula): Everyone in a class of 30 wants to shake hands and greet everyone else in the room exactly 1 time. Try and write a formula to describe that scenario. 1. Write a flow chart to do the following (not for a computer, just for you - and yes, it has to be done nicely e.g. typed): Registering for classes at school starting from when you have the numbers of the three courses you want to register for. 2. A concept that is similar to an algorithm is the heuristic (rule based thinking). Please research the computer science concept of a heuristic and describe it in two short paragraphs. 3. If you have a variable named X, tell me what the expression X= 5 means in English (hint: = does not mean equals). 4. 5, what does the % operator do in most high level computing languages like C or Python