Aequiprobabilism is a big word that means everyone has an equal chance of winning or losing. It's like if you and your friends are playing a game, and everyone has the same chance of winning.
Let's say there are 4 players in the game. Aequiprobabilism means each player has a 25% chance of winning. That's because there are 4 players, and if you divide 100% by 4, you get 25%.
So, no one has an advantage over anyone else. Aequiprobabilism is a fair way to play games or make decisions because everyone has the same chance of getting what they want. It's like giving everyone a fair shot without any special treatment.