"Yellow and red."
Translation:Buí agus dearg.
what is the difference between dearg and rua?
I see, so it's like the sort of difference there is between yellow and blond?
While is probably developed as a contraction of agus, you don't need to use an apostrophe to indicate that - you'd just write buí is dearg. (Though I don't know if Duolingo will accept is for agus everywhere).