SSC CHSL 31 JAN 2017SHIFT 3 TIER 1 REASONING QUESTION 9

9.A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
CD, GH, KL, ?
Options:
1. PN
2. NO
3. NP
4. OP
Answer: 4
CD(3, 4) , GH(7, 8), KL(11, 12)

next term will be 15, 16 i.e. OP