Question

Геометрическая прогрессия

Answer 1

$bn = b1 \times {q}^{n - 1 } \\ b1 = \frac{bn}{ {q}^{n - 1} } = \frac{24}{ {3}^{2 - 1} } = \frac{24}{ {3}^{1} } = \frac{24}{3} = 8$