Write the first four terms of the sequence.an = 

A. a1 = 2, a2 = - 1, a3 = , a4 = 
B. a1 = 2, a2 = 1, a3 = , a4 = 
C. a1 = -2, a2 = - 1, a3 = , a4 = 
D. a1 = -2, a2 = 1, a3 = , a4 = 

Answer: B

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