Brilliant Secondary School
There are 731 students in first secondary in Brilliant Secondary School. Is it possible to prove mathematically that there are at least three students who have the same birthday?
Assume that they are born in non-leap years.
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1 solution
Moderator note:
You should clarify whether these students are born in a leap year or not. What you've used is known as Pigeonhole Principle.
Let you know the first step. Divide the students into three groups as followed: 365, 365, 1. You know why? Tell you soon.