Первый член
a = 4
Показатель
q = (-4/3) / 4 = -1/3
Сумма
S = a/(1-q) = 4/(1+1/3) = 4/(3/3 + 1/3) = 4 / (4/3) = 3
Первый член
a = 4
Показатель
q = (-4/3) / 4 = -1/3
Сумма
S = a/(1-q) = 4/(1+1/3) = 4/(3/3 + 1/3) = 4 / (4/3) = 3