Question

(Bn)-геометрическая прогрессия
b = -1/25, q = 5
Найти: b3 и S3

Answer 1

b2 = -1/25 * 5 = -1/5;

b3 = -1/5 * 5 = -1;

b4 = -1 * 5 = -5;

b5 = -5 * 5 = -25.