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Uppercase letters such as A and B are used in probability notation to represent:

AErrors
BEstimates
CElements
DEvents
Answer & Solution
Correct answer: D. Events
1. Each stands for a set of outcomes of interest. 2. Its probability is then written P of that letter. 3. The letters represent events. _Source: OpenStax Introductory Statistics 2e, Chapter 3, Probability Topics._
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