Question

calcule a soma dos dez termos da pg (2,1, 1/2, 1/4,....)

Answer 1

Sn = a1.(1-q^n)/(1-q)
Sn = 2.(1-1/2^10)/(1-1/2)
Sn = 2.(1 - 1/1024)/(1/2)
Sn = 2 . [(1024-1)/1024]. 2
Sn = 4 . 1023/1024
Sn = 4092/1024
Sn = 1023/256