Question

Свойства арифметической прогресси

Answer 1

1
b₁₄ = 9*14² - 4*14 = 9*196 - 56 = 1764 - 56 = 1708

2
c₁₁ = c₁ + 10d = 6 + 10*5 = 6 + 50 = 56