2021 IMO Problems/Problem 6
Problem
Let be an integer, be a finite set of (not necessarily positive) integers, and be subsets of . Assume that for each the sum of the elements of is . Prove that contains at least elements.
Video solution
https://youtu.be/vUftJHRaNx8 [Video contains solutions to all day 2 problems]
See also
2021 IMO (Problems) • Resources | ||
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