In this post we will talk about equiprobable events. This concept is what we cover in teaching children and is the starting point for the concept of probability. What is an equiprobable event? Equiprobable events are events with the same probability of occurring, that is, they have the same chance of occurring. It appears a lot in probability theory. This way, we will define it as: Definition (Equiprvable Events): Let there be a sample space $\Omega$ and a random experiment from this space. When we take a class of events from this finite space $\mathcal{A}=\\{e_1, e_2,\dots,e_n\\}$. Events are equiprobable if these events have the same probability of occurring. $$\mathbb{P}(e_1) = \mathbb{P}(e_1) = \dots = \mathbb{P}(e_n) =\dfrac{\text{número de eventos favoráveis} }{\text{total de casos} }$$