a. List all 3-combinations for the set {x1,x2,x3,x4,x5}.
Chapter 9, Problem 9.181(choose chapter or problem)
a. List all 3-combinations for the set {x1,x2,x3,x4,x5}. Deduce the value of5 3.b. List all unordered selections of two elements from the set{x1,x2,x3, x4,x5,x6}. Deduce the value of6 2.
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