Question

Calcule a soma dos termos da PG (5,50,500000) :

Answer 1

a2=50

logo razão q= a2/a1= 50/5 =10

an= a1.q^(n-1) = 5.10^(n-1) = 500000= 5.10^5

logo (n-1) = 5 , logo n=6

S6 = a1(q^n -1)/(q-1) = 5.(10^6 -1)/9 = 5(999999)/9 = 5(111111) = 555.555

S6 = 555.555