It told me there were 2 correct answers: "Bitte mit welchem" and "Bitte mit welcher." Both are correct as the unnamed things can be masculine/neuter or feminine.
"welchen" is for plural nouns only.
why is it the -m version for all the other "mit + welche(X)" things, except this one? qq
I believe the -m version works now? I just put "mit welchem" and it was fine.
I'd also like to know the reason...
Isn't this because it's the dative case?
Don't quite follow... Welchen is the only one that's wrong then?
This is the second time around I went through this question and I answered it opposite to what I answered last time (as the solution told me) and it's still wrong!
"Please with which one" doesn't make sense in English.