a. List all 2-combinations for the set {x1, x2, x3}.
Chapter 9, Problem 1E(choose chapter or problem)
Problem 1E
a. List all 2-combinations for the set {x1, x2, x3}. Deduce the value of .
b. List all unordered selections of four elements from the set {a, b, c, d, e}. Deduce the value of .
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