Let {A, B} be a partition of the set of S = {1, 2,..., 7}, where A = {1, 4, 5} and B =

Chapter 3, Problem 3.25

(choose chapter or problem)

Let {A, B} be a partition of the set of S = {1, 2,..., 7}, where A = {1, 4, 5} and B = {2, 3, 6, 7}. Letn S. Prove that if n2+3n42 is even, then n A.

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