A geometric sequence is given. Find the common ratio and write out the first four terms.{un} = 
A. r = 3; u1 = 3, u2 = 
, u3 = 
, u4 = 
B. r = 3; u1 = 3, u2 = 
, u3 = 
, u4 = 
C. r = 
; u1 = 
, u2 = 
, u3 = 
, u4 = 
D. r = 
; u1 = 3, u2 = 
, u3 = 
, u4 = 
Answer: D
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A. 
B. 
C. 
D. 
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