A geometric sequence is given. Find the common ratio and write out the first four terms.{sn} = 
A. an = 6 
n-1
r = 
; s1 = 6, s2 = 3, s3 = 
, s4 = 
B. an = 6 ? (2)n-1
r = 2; s1 = 6, s2 = 12, s3 = 24, s4 = 48
C. an = 
(6)n-1
r = 
; s1 = 6, s2 = 12, s3 = 24, s4 = 48
D. an = 6 
n-1
r = 
; s1 = 6, s2 = 
, s3 = 
, s4 = 
Answer: A
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