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In an arithmetic series, there are equal intervals between each of the terms, as for instance 2 + 5 + 8 + 11. If the first term in an arithmetic series is 5, the last term is 25, and the sum of the terms is 90, what is the third term? A: 17 B: 13 C: 9 D: 21 What in the world is a trial and...

In an arithmetic series, there are equal intervals between each of the terms, as for instance 2 + 5 + 8 + 11. If the first term in an arithmetic series is 5, the last term is 25, and the sum of the terms is 90, what is the third term? A: 17 B: 13 C: 9 D: 21 What in the world is a trial and...