AMC / AIME · Inclusion-Exclusion · Medium
Inclusion-Exclusion: How many integers from math to math are divisible by neither math nor math?
Unions without double-counting.
Try the problem
How many integers from to are divisible by **neither** **nor** ?
Hint and answer
Concept to use
Three sets.
Hint
Count divisible by or , subtract from .
Answer
20
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