Question

ache a soma dos 10 primeiros termos da pg (2,4,8,...)

Answer 1

S10= A1 (q{n} - 1) / q-1

S10= 2 ( 2{10} - 1) / 2-1 
S10= 2 (1024 - 1) /1
S10= 2 *1023
S10= 2046

Answer 2

Razão= 2
Sn= 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024
Sn= 2046