Letter & Number Sequences
7 free practice questions with explanations
PassNova has 7 free 11+ Verbal Reasoning practice questions on Letter & Number Sequences, each with a clear explanation. Practise them in the browser with instant feedback — 100% free, no sign-up, on any device. Updated for 2026.
Letter & Number Sequences: example questions & answers
7 worked examples with answers and explanations below. Practise them in the browser with instant feedback on every answer.
What comes next in the sequence: AB, CD, EF, GH, …?
- AHI
- BIJ✓
- CJK
- DGI
Answer: Each pair uses the next two letters of the alphabet, so after GH comes IJ.
What comes next: AZ, BY, CX, …?
- ADV
- BDW✓
- CEW
- DDX
Answer: The first letter goes A, B, C, D… and the second goes Z, Y, X, W… so the next pair is DW.
What is the next number: 3, 6, 12, 24, …?
- A30
- B36
- C48✓
- D26
Answer: Each number doubles, so 24 × 2 = 48.
What is the next number: 2, 5, 10, 17, …?
- A24
- B26✓
- C22
- D34
Answer: The gaps increase by odd numbers (+3, +5, +7…), so 17 + 9 = 26.
What comes next: 1, 4, 9, 16, …?
- A20
- B25✓
- C24
- D32
Answer: These are square numbers (1², 2², 3², 4²), so the next is 5² = 25.
What comes next: Z, X, V, T, …?
- AS
- BR✓
- CU
- DQ
Answer: The letters go back two each time (Z, X, V, T…), so the next is R.
What is the missing number: 100, 90, 81, 73, …?
- A66✓
- B64
- C65
- D70
Answer: The differences decrease by one each time (−10, −9, −8, −7), so 73 − 7 = 66.