I don't get this question

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test

Margie is practicing for an upcoming tennis tournament. her first serve is good 20 out of 30 times on average. margie wants to know the estimated probability that her first serve will be good at least four of the next six times she serves. how could she design a simulation for this scenario?

The sum of five and a number n is at least 12