An arithmetic sequence is given. Find the common difference and write out the first four terms.
A. d = 
; 
, 
, 
, 
B. d = 
; 
, 
, 
, 
C. d = 
; 
, 
, 
, 
D. d = 
; 
, 
, 
, 
Answer: A
Mathematics
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as an imaginary number.
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