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Which of the following sets of ordered pairs represents a function?
A$\{(1,2),(1,4),(2,5)\}$
B$\{(1,2),(2,3),(3,4)\}$
C$\{(1,2),(1,3)\}$
D$\{(2,1),(2,2)\}$
Answer & Solution
Correct answer: B. $\{(1,2),(2,3),(3,4)\}$
Only {(1,2),(2,3),(3,4)} has each first-coordinate appearing once; the others repeat an input with different outputs.
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