We call it The Slot Method.  Using this method, when asked to find a probability of a compound event A, we will find the total number of outcomes, n(S), and the total number of successful outcomes n(A) and use slots for each of the number of events (either independent or dependent) that make up the compound event.

phrasal verb\n\n : to find a place for (someone or something) in a schedule, plan, etc. I can slot you in at 2 p.m.

Slot machines are not programmed to pay out less on the weekends. The results on slot machines are all random so there is no certain time period that they will be paying out more wins.

Again, you can't tell if a slot machine is due to hit. The reason is the same as before: each spin has a random outcome.