CAPE Pure Mathematics Unit 2 · May/June 2015 · Paper 1 · Question Q21

The sum to infinity of a geometric series is \frac{1}{1 - 2x}. The range of x is

1. (A)-1 < x < 1
2. (B)-2 < x < 2
3. (C)-\frac{1}{2} < x < \frac{1}{2}
4. (D)x > -\frac{1}{2}