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Which relation from {1,2,3} to {a,b} is NOT a function?
A{(1,a),(1,b),(2,a),(3,b)}
B{(1,a),(2,a),(3,b)}
C{(1,a),(2,b),(3,a)}
D{(1,b),(2,b),(3,b)}
Answer & Solution
Correct answer: A. {(1,a),(1,b),(2,a),(3,b)}
The input 1 is paired with both a and b, so it has two outputs.
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