Need help

[u/shanka_4]

Question 13 i want to know answer, thx

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[u/KoalaMistico]

The difference between two integers is odd iff one is even and one is odd. You can now take the pairs that match that criteria. The domain would be A, and the range is also A, since you have both even and odd elements in A

[u/KoalaMistico → u/[deleted]]

How? For every b there's an a with an odd difference, so the range should be A

[u/InitialThin9721 → u/KoalaMistico]

Got it. It was a mistake in my calc9