For the geometric sequence 1/2,1/4,1/8,…1/2, 1/4, 1/8, \dots1/2,1/4,1/8,…, what is the sum of the first nnn terms?
1−(1/2)n1 - (1/2)^n1−(1/2)n
1−(1/2)n−11 - (1/2)^{n-1}1−(1/2)n−1
1/2(1−(1/2)n)1/2(1 - (1/2)^n)1/2(1−(1/2)n)
(1/2)n(1/2)^n(1/2)n