Consider functions f: {1,2,3,4)→ {a,b,c). a. How many functions are there? b. How many functions are injective? c. How many functions are surjective?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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**Problem 3.**

Consider functions \( f : \{1, 2, 3, 4\} \rightarrow \{a, b, c\} \).

a. How many functions are there?

b. How many functions are injective?

c. How many functions are surjective?
Transcribed Image Text:**Problem 3.** Consider functions \( f : \{1, 2, 3, 4\} \rightarrow \{a, b, c\} \). a. How many functions are there? b. How many functions are injective? c. How many functions are surjective?
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