Alex L. answered 06/15/21
Experienced and licensed math educator w/ practical statistics exp.
Sample space is the set of all possible outcomes.
With two white balls (W) and three red (R), the sample space of the box is {W W R R R} with size 5.
Event A is choosing a red ball. Each red ball is no different than another, so picking any R is equally likely. There are 3 R in the sample space of 5, so P(A) = 3/5