Papyrus, my point is that we don't need any information about coins that are not quarters. |
1. We know that there are some quarters.
2. We know that quarters are a kind of coin.
3. We know that no quarters Jamal has are dated before 2000, which is another way of saying that all of his quarters are dated 2000 or later.
This is enough to tell us for sure that there are quarters, dated 2000 or later, in Jamal's pocket, and since quarters are a kind of coin, we know there are some coins dated 2000 or later in Jamal's pocket.
But there's no information assuring us that quarters are dated at all. One could just as easily conclude "Quarters don't have dates on them" as "So,e quarters are dated after 1999." This means it is not true that "C" must be true.
There is a missing premise.
Basic high school geometry doesn't seem to be an effective substitute for critical thinking.