Key term for Edexcel GCSE Mathematics, used in Probability Principles.
An informal name for the Addition Law when calculating the probability of one mutually exclusive event or another occurring.
"OR" Rule appears in Edexcel GCSE Mathematics revision content for Probability, especially Probability Principles and Outcome Sets.
Create a free account to access Edexcel GCSE Mathematics revision notes, track progress, and practise related key terms.
