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Minimal cardinality (Posted on 2016-03-16) Difficulty: 3 of 5
Let S be a set of n distinct real numbers.
Let AS be the set of numbers that occur as averages
of two distinct elements of S.

For a given n >= 2, what is the smallest possible number
of distinct elements in As?

See The Solution Submitted by Ady TZIDON    
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  Subject Author Date
SolutionSimplified versionAdy TZIDON2016-03-18 04:32:45
SolutionSolutionBrian Smith2016-03-16 10:34:44
Solutionproposed solutionCharlie2016-03-16 09:48:15
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