AMC / AIME · Inclusion-Exclusion · Medium
Inclusion-Exclusion: How many functions from a math-element set to a math-element set are surjective?
Unions without double-counting.
Try the problem
How many functions from a -element set to a -element set are **surjective**?
Hint and answer
Concept to use
Three sets.
Hint
.
Answer
14
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