SSC CGL (Prelims) General: Number/Alphabet Series questions with solutions

Q1. Solve: BC, EF, HI, ?

1. KL
2. JK
3. LM
4. MN

Answer: KL

The pairs are BC, EF, HI: the first letters are B, E, H and the second letters are C, F, I. Each letter advances by 3 positions in the alphabet, so the next pair is K L.