👉 In mathematics and computer science, a prechosen set is a collection of elements that are already chosen or have been selected. It is often used in combinatorial analysis to denote a subset of a universe (which could be any finite set). For example: - A prechosen set of 10 numbers from the set {1,2,3,...,9} would be denoted as {1,2,3,...,9}. This notation is used in combinatorics and probability
