Let n ∈ N. What is the smallest value of k such that every k-subset S of [n] has at least two 2-subsets {a, b} and {c, d} such that |a − b| = |c − d|?
(Here the two 2-subsets must be distinct, but they need not be disjoint

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the answer is -1 1/5, also a

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-lavira : )

you are having disney spells!