What is the sum of the first 10 terms of the geometric series below?

1+2+4+8 ...

a.) 511

b.) 512

c.) 1023

d.) 1024

This is what I got:

It was being multiplied by 2.

1,2,4,8,16,32,64,128 (got harder : P)

128*2=256

then

256*2=512.

But, don't be tricked, it asks for the SUM of all 10 terms.

Added together, 1023.

Thus, C, is your answer.