In a group of 30 people, must at lest 3 have been born in the same month? Why?
To show that at least people must have been born in the same month in a group of people.
A group of people.
Using the pigeonhole principle- the pigeonhole principle states that there must be at least one box which will contain two or more objects if objects are put in boxes.
In the above problem there are pigeons (people) and pigeonholes since there are months in a year.
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