Because those two events cover everything between them, their probabilities must add to:
ATen
BOne
CZero
DTwo
Answer & Solution
Correct answer: B. One
1. Every outcome falls into exactly one of the two.
2. The whole sample space carries a probability of one.
3. So P(A) plus P(A prime) equals one.
_Source: OpenStax Introductory Statistics 2e, Chapter 3, Probability Topics._
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