“Fancy” math 
, still most of the time it is 50%, just not the first step where it should be 33% chance
But if you wanted to start to go this route, calculating a random number and checking what the value is might be getting easier and more expandable:
Calculation: {{ floor(random() * (max - min) + min) }}
(calculation in the image has a tiny mistake by adding an end bracket too many!)
