Probability quantifies how likely it is that an event will occur. Probability only takes values between and , where denotes no chance of an event to occur and denotes that an event will definitely happen.
A higher probability indicates a greater chance that an event will occur.
The probability of an event can be calculated with:
Suppose that a box contains 2 white and 3 black balls. The probability of picking a white ball is:
Since there are white balls, the number of ways to pick a white ball is . The total number of outcomes is because there are balls to choose from. This results in a probability of .
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