Найдите число на 15-м шаге: 1 → 3 → 5 → 7 → 9

  1. 29
  2. 30
  3. 28
  4. 31

📝 Detailed explanation

Это арифметическая прогрессия, где первый член равен 1, а разность равна 2. 15-й член равен: 1 + 14 × 2 = 1 + 28 = 29.
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