Exam-style question
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Consider f: {a,b,c} → {0,1,2,3}, where f(a) = 0, f(b) = 1 and f(c) = 1. Which member of the co-domain is not used as an output?.
- A.0
- B.1
- C.2
- D.All members are used
Model answer
What a good answer should say
- 2
Explanation
Why this works
The outputs are 0, 1 and 1. Therefore, 2 is a member of the co-domain but is not an output of this function.
The member 3 is also unused, but it is not offered as an option.
Common mistake
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