CAPE Pure Mathematics Unit 2 · May/June 2015 · Paper 1 · Question Q19

Which of the following sequences, \{u_n\}, converges?

1. (A)\left\{\left(\frac{1}{2}\right)^n\right\}
2. (B)\left\{\left(\frac{1}{2}\right)^{-n}\right\}
3. (C)\left\{(-1)^n\right\}
4. (D)\{2^n\}