Arithmetic Sequences: Common Difference, 15, 13, 11, 9, ..., an = d ( n - 1 ) + a1, an = a(n-1) + d a1 = , The number of chairs in a row is increased by 1., Geometric Sequences: Common Ratio, an = a1 r (n-1), an = a(n-1) * r a1 =, 1, 4, 16, 64, ..., A population of bacteria doubles.,

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