A geometric sequence is given. Find the common ratio and write out the first four terms.
A. an = 
(4)n-1
r = 
; 4, 8, 16, 32, ...
B. an = 4 
n-1
r = 
; 4, 2, 1, 
, ...
C. an = 4 
n-1
r = 
; 4, 1, 
, 
, ...
D. an = 4 ? (2)n-1
r = 2; 4, 8, 16, 32, ...
Answer: B
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