Question 109
MediumOriginal questionHow many onto functions are there from a set with 3 elements to a set with 3 elements?
Show the answer and explanation
CorrectNot quiteAnswer B
Correct answer: B
Explanation
From a 3-element set onto a 3-element set, onto means one-one too.
So it is the number of arrangements: .
Worth noting
27 counts every function, including those that miss an element.
- Concept
- Counting functions
- Typical timeTypical
- 90 s
- Your timeYours
- —
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