alleryA function $f:A\to B$ is one-one (injective) if:
A$f(a)=f(b)$ for all $a,b$
Bevery element of $B$ has a pre-image
Cdistinct elements of $A$ have distinct images
Dits domain equals its range
Answer & Solution
Correct answer: C. distinct elements of $A$ have distinct images
Injective (one-one): distinct inputs map to distinct outputs.
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