Question 2 - Advanced Basics Practice Test for the Math Basics

Which of these sets is a function?

\[{ (2, 2), (4, -15), (2, -5), (7, -27) }\]
\[{ (3, 12), (-2, 5), (3, -5), (-2, 25) }\]
\[{ (4,-18), (1, 5), (3, 7), (4, -30) }\]
\[{ (2, 3), (5, -5), (3, 2), (4, 17) }\]

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