1443985793005932547

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2021-10-01T17:06:55.000Z
Let [n] denote the ground set {1,2,...n}. Suppose F is a collection of n distinct non-empty subsets of the [n]. Prove that there is an element in [n] that can be removed from all the sets in F such that the resulting collection also has n distinct sets. #exportoberScreenshot