If Center 2 recycles three kinds of material, then which one of the following kinds of material must Center 3 recycle?

jg.cassanello July 12, 2020

Does this condition "Only one of the recycling centers recycles plastic" should be taken to mean that necessarily one center MUST recycle plastic?

I'm asking in response to the video explanation. If not, what creates the condition that says that plastic must be recycled ?

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jg.cassanello July 12, 2020

Or is this condition created by the passage itself, by saying "Exactly five kinds of material are recycled at these recycling centers"?

Skylar July 12, 2020

@jg.cassanello, happy to help!

Both the claim that "exactly five kinds of material are recycled at these recycling centers" and the claim that "only one of the recycling centers recycles plastic" tell us that plastic must be recycled. Note how these claims would be different if they were instead phrased as "five kinds of material could be recycled at these recycling centers" and "only one of the recycling centers can recycle plastic."

Does that make sense? Please let us know if you have any other questions!

jg.cassanello July 15, 2020

Yes, it does. I failed to get this in the first reading. But, yeah, it makes sense.

iggy.salas August 24, 2021

Had exactly the same doubt here. Thanks!