Common Core · High school
HSS-CP.B.7
High school — Apply the addition rule P(A or B) = P(A) + P(B) - P(A and B), and interpret it in context.
The skill that covers it
What a student should be able to do
- Use P(not A) = 1 - P(A) to find the probability of a complement.
- Add probabilities for events that cannot both happen, and subtract the overlap when they can.
- Multiply probabilities for independent events joined by "and".
- Answer an "at least one" question by working with the complement instead.