CAPE Pure Mathematics Unit 2 · May/June 2016 · Paper 1 · Question Q31

In how many ways can the letters P, Q, R, S and T be arranged so that P and Q are always together, and R and S are always together?

1. (A)3!
2. (B)5!
3. (C)5! \, 2
4. (D)3! \times 2 \times 2