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 error? I don't get this question.
According to the answer booklet--------> B. The trial-and-error method is most appropriate for solving this kind of problem.
A: 17
B: 13
C: 9
D: 21
What in the world is a trial and error? I don't get this question.
According to the answer booklet--------> B. The trial-and-error method is most appropriate for solving this kind of problem.