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Complementary counting is the counting of the complement of the set or the event which we are taking into consideration.
Logical Strategy: The Complementary Problem
Preparing for a math contest?
Working through past problems on one idea at a time is one of the most effective ways to prepare. These are real problems from the AMC 8, AMC 12 and AIME, the national math competitions for middle and high school students, each with a worked solution on LIVE by Po-Shen Loh.
- Complementary counting problems 21 from AMC 8, AMC 12, AIME
- Complementary probability problems 12 from AMC 8, AMC 12, AIME