RS Aggarwal Solutions for Class 8 Chapter 25 Probability- Probability is the branch of mathematics concerning numerical descriptions of how likely an event is to occur, or how likely it is that a proposition is true. The Probability of an event is a number between 0 and 1, where, roughly speaking, 0 indicates impossibility of the event and 1 indicates certainty. As the Chapter is about Probability, in our daily life, we use Probability to make decisions when we don’t know what the output would be. Most of the time we won’t perform actual Probability, but instead, we use subjective Probability to make judgemental calls and determine the best course of action.