Classify the sequence as arithmetic, geometric, Fibonacci, or none of these and supply the next term.
?
1, 6, 7, 13, ...
?
A. None and a5 = 97
B. Geometric and a5 = 78
C. Arithmetic and a5 = 14
D. Arithmetic and a5 = 19
E. Fibonacci and a5 = 20
Answer: E
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