The third choice is appropriate. an = 5 - 3(n - 1); all integers n ≥ 1
_____ This equation follows the form for the general term of an arithmetic sequence. an = a1 + d(n - 1) where a1 is the first term (corresponding to n=1), and d is the common difference. From the problem statement, a1 = 5 and d = 2 - 5 = -3.
