Example 1.6.9.
How many functions \(f: \{1,2,3,4,5\} \to \{a,b,c,d\}\) are surjective?
How many functions \(f: \{1,2,3,4,5\} \to \{a,b,c,d,e\}\) are surjective?
How many functions \(f: \{1,2,3,4,5\} \to \{a,b,c,d\}\) are surjective?
How many functions \(f: \{1,2,3,4,5\} \to \{a,b,c,d,e\}\) are surjective?