IZhO 2014 Problem 3
- Answer
There are given 100 distinct positive integers. We call a pair of integers among them good if the ratio of its elements is either 2 or 3 . What is the maximum number of good pairs that these 100 numbers can form? (A same number can be used in several pairs.)
Dataset text NuminaMath olympiads. Quoted with source.
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180
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