Question: Let D Zn be an (n,k, ) - difference set and let D = Zn D. Prove that any non-zero element of Zn occurs

Let D Zn be an (n,k,) - difference set and let D = Zn \ D. Prove that any non-zero element of Zn occurs 2(k-) times as a difference of elements, one in D and the other in D .

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