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The formula for the probability of an event is given below and explained using solved example questions. Click to know the basic probability formula and get the list of all formulas related to maths probability here.
Probability: the basics. Explore what probability means and why it's useful. Probability is simply how likely something is to happen. Whenever we’re unsure about the outcome of an event, we can talk about the probabilities of certain outcomes—how likely they are.
Probability Formulas are used in determining the possibilities of an event by dividing the number of favourable outcomes by the total possible outcomes. By using this formula, we can estimate the probability associated with a specific occurrence.
FORMULA. For an experiment whose sample space S consists of equally likely outcomes, the theoretical probability of the event E is the ratio. P(E) = n(E) n(S), where n(E) and n(S) denote the number of outcomes in the event and in the sample space, respectively.
Probability. How likely something is to happen. Many events can't be predicted with total certainty. The best we can say is how likely they are to happen, using the idea of probability.
Probability is all about how likely is an event to happen. For a random experiment with sample space S, the probability of happening of an event A is calculated by the probability formula n(A)/n(S).
Probability Formula. An experiment has equally likely outcomes if every outcome has the same probability of occurring. Given that all outcomes are equally likely, we can compute the theoretical probability of event \(A\) using this formula: \(P(A)=\dfrac{\text { Number of ways for } A \text{ to occur}}{\text { Total number of outcomes }}\)