Write the first four terms of the sequence.an = 
A. a1 = 1, a2 = - 
, a3 = 
, a4 = - 
B. a1 = 1, a2 = - 
, a3 = 
, a4 = - 
C. a1 = 1, a2 = 
, a3 = - 
, a4 = 
D. a1 = -1, a2 = 
, a3 = - 
, a4 = 
Answer: A
Mathematics
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? 
A. 
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