Civil Service Numerical Reasoning Test Number Sequences and Patterns 2 — Questions and Answers
Question 1: What comes next: 2, 3, 5, 8, 13, __?
- 21 (Correct answer)
- 18
- 20
- 24
Correct answer: 21
This is the Fibonacci sequence — each term is the sum of the two preceding terms: 8 + 13 = 21.
Question 2: What is the missing number: 5, 10, 20, __, 80?
- 40 (Correct answer)
- 30
- 50
- 35
Correct answer: 40
Each term is multiplied by 2: 5, 10, 20, 40, 80.
Question 3: What is the next number: 1, 8, 27, 64, __?
- 125 (Correct answer)
- 100
- 144
- 81
Correct answer: 125
These are cubes: 1³, 2³, 3³, 4³, 5³. Next = 5³ = 125.
Question 4: Find the missing term: 45, 40, 34, 27, __, 10?
- 19 (Correct answer)
- 20
- 18
- 21
Correct answer: 19
Differences: −5, −6, −7, −8, −9. From 27: 27 − 8 = 19.
Question 5: What comes next in the sequence: 2, 6, 18, 54, __?
- 162 (Correct answer)
- 108
- 216
- 72
Correct answer: 162
Each term is multiplied by 3: 2, 6, 18, 54, 162.
Question 6: What is the missing number: 1, 1, 2, 3, 5, 8, __, 21?
- 13 (Correct answer)
- 10
- 11
- 15
Correct answer: 13
Fibonacci sequence: each term = sum of the two before it. 5 + 8 = 13.
Civil Service Numerical Reasoning Test Number Sequences and Patterns 2
What comes next: 2, 3, 5, 8, 13, __?