I feel like this whole question was poorly worded

@bobby, Great question. It doesn't declare that each of the 5 materials must be recycled, so it's not necessary that this is the case. Here are the rules of the game: 1) Max 3 materials at 1 center 2) W - >N 3) 2 - >1 4) Ex. 1 P 5) P - >/G (G - >/P) For this question, we know that each center has 3 materials 1 2 3 _ _ _ _ _ _ _ _ _ This means 1 and 2 have the same materials. Since there's only 1 P, it must go in 3 (A) is out because we know that 2 and 1 are recycling the same things because of rule 3. Rule 3 also allows us to automatically eliminate (C) and (E) since we know 2 and 1 are recycling the same things. Now we're down to (B) and (D). (B) says only 3 recycles N. Could this be true? The problem with this is that if only 3 recycles N, that means that neither 1 nor 2 can recycle W. We get this from the contrapositive of rule 2 (/N - >/W). So if P, N, and W can't go in 1 or 2, what're we left with? Just T, but we have 3 total spots and with T and G, only 2 are occupied. Thus, this can't be true. Now we're left with (D). If only 3 recycles T, then we have T and P in 3. We could put W and N in 1 and 2 with G and then another N in 3, and this would work. 1 2 3 G G P N N T W W N Does this make sense? Let us know if you have any more questions!

I think it DID declare all 5 must be recycled.. cuz it says: "exactly 5 needs recycle" aka not 4 or less. If any one of it is not recycled, then it's not "exactly" 5, it's less than 5.