A geometric sequence is given. Find the common ratio and write out the first four terms.{sn} = {4n}
A. r = 4; s1 = 4, s2 = 16, s3 = 64, s4 = 256
B. r = 4n; s1 = 4, s2 = 16, s3 = 64, s4 = 256
C. r = 4; s1 = 4, s2 = 8, s3 = 12, s4 = 16
D. r = 4n; s1 = 4, s2 = 8, s3 = 12, s4 = 16
Answer: A
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