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Identifying a Function from a Set of Ordered Pairs

publish date: 2026/05/23 22:20:49.336882 UTC

Let \(A = \{1, 2, 3, 4\}\) and \(B = \{2, 4, 5\}\). Which of the following relations from \(A\) to \(B\) is a function?

\(R_1 = \{(1, 2), (1, 5), (2, 2), (3, 4), (3, 5), (4, 5)\}\)

\(R_4 = \{(1, 4), (2, 5), (3, 2), (4, 4)\}\)

\(R_2 = \{(1, 4), (4, 2), (4, 5)\}\)

\(R_3 = \{(3, 2), (3, 4), (3, 5), (1, 4)\}\)

Introduction to Differential Calculus (Systematic Studies with Engineering Applications for Beginners) - 2012