Solve the problem.A sequence has a1 = 5, and each term is found by adding 4 to the preceding term. Find the general nth term and the 40th partial sum of the series.
A. an = 9 + 4n
S40 = 9
B. an = 5 + 4n
S40 = 3400
C. an = 1 + 4n
S40 = 3320
D. an = 1 + 4n
S40 = 6640
Answer: C
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