0 Hi Andrew,02br
00yes, as Clive says, I think the plural is the best choice. My books often say "Chapters 3 and 4", not "Chapter 3 and 4".02br
00It is interesting to notice that although you should say "Chapters 3 and 4", you should say "A black and a white cat" and not "A black and a white cats". 050010id1