2021 IMO Problems/Problem 6
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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]
