The sequence is defined recursively. Write the first four terms.a1 = 
; an = 
A. a1 = 
, a2 = 
, a3 = 
, a4 = 
B. a1 = 
, a2 = 
, a3 = 
, a4 = 
C. a1 = 
, a2 = 7
, a3 = 49
, a4 = 343
D. a1 = 
, a2 = 7, a3 = 7
, a4 = 49
Answer: A
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