question on The Language of relations and functions

[Fuzzbot]

I could not find a discrete mathematics section, apologies in advance if this is not in the right forum.

Looking at the following problem from my text book. I am confused why the solution points to a set {1,3,5}, when both A and B are {1, 2, 3}.
Chatgbt thinks the textbook made a mistake(haha). I am not so sure of myself. Can anyone explain?

 

[pka]

That is a typo in the textbook. It should say [imath]B=\{1,3,5\}[/imath]

 

[Fuzzbot]

That is a typo in the textbook. It should say [imath]B=\{1,3,5\}[/imath]

Thank you! wasn't sure if I was missing something.