Question

PG

 

Calcule a soma dos des primeiros termos da pg (1,3,9)

Answer 1

olá!!

a1=1

q=3/1=3

n=10

sn=?

 

an=a1.q^n-1

a10=1.3^10-1

a10=3^9

a10=19683

 

Sn=a1.(q^n-1)/q-1

S10=1.(3^10-1)/q-1

S10=1.59049-1/3-1

S10=59048/2

S10=29524

 

Resposta 29524