Discrete Mathematics
# Bijections

A function \(f\) maps the elements of \(A = \{14, 16, 18, 20\}\) to elements of \(B =\{55, 66, 77, 88, 99\}.\) How many of the possible maps \(f\) are not injective?

**Details and assumptions**

A function is **injective** if each element in the codomain is mapped onto by at most one element in the domain.

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