AMC / AIME · Pigeonhole Principle · Medium
Pigeonhole Principle: What is the minimum number of people needed to guarantee that four share a birth month?
Forced collisions.
Try the problem
What is the minimum number of people needed to **guarantee** that **four** share a birth month?
Hint and answer
Concept to use
Strong form.
Hint
At most per month → .
Answer
37
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