Explanation:
Arithmetic sequences: a2 = a1 + n
Geometric sequences: a2 = a1 * n
a. geometric (2 = 1 * 2, 4 = 2 * 2, 8 = 4 * 2 ...)
b. arithmetic (8 = 5 + 3, 11 = 8 + 3 ...)
c. arithmetic (10 = 5 + 5)
d. geometric (100 = 10 * 10)
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