Question

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Answer 1

$a1 = 2 \\ a8 = 3 \\ an = a1 + (n - 1) \times r \\ logo \: a8 = 2 + (8 - 1) \times r \\ 3 - 2 = 7r \\ 1 = 7r \\ r = \frac{1}{7}$