Let's say we have a set of four balls called: the red ball, the blue ball, the green ball, the yellow ball. Each ball can be either made of wood or made of iron.
If I want to say that the first three of them are made of wood, which form of the following sentence should I use?
The red, the blue and the green [ball/balls] [is/are] made of wood.
Also, did I use the article "the" correctly?
The example is a little bit abstract, but it comes from a far more abstract sentence. I am writing a thesis about a phenomenon that can be described by several models, of which some possess a common property.
This question is similar to that one, but I use "and" instead of "or" which may potentially affect the answer.