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Rogerio
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Each one of the 23 members of a moviegoers' club has selected his two favorite movies from a 50 movies list.
It is noted that any two members have at least one favorite movie in common.
What is the largest number of members that have necessarily selected a same movie?
Prove that.
It is noted that any two members have at least one favorite movie in common.
What is the largest number of members that have necessarily selected a same movie?
Prove that.