CFAT Problem Solving: Number Series 3 — Questions and Answers
Question 1: What is the next number: 2, 3, 5, 8, 13, 21, ?
- 29
- 31
- 34 (Correct answer)
- 35
Correct answer: 34
Each term is the sum of the two preceding terms: 13 + 21 = 34.
Question 2: Which number comes next: 50, 25, 50, 25, 50, ?
- 25 (Correct answer)
- 50
- 75
- 100
Correct answer: 25
The sequence alternates between 50 and 25, so the next term is 25.
Question 3: Find the next term: 1, 3, 7, 15, 31, ?
- 47
- 55
- 63 (Correct answer)
- 64
Correct answer: 63
Each term equals (previous × 2) + 1, so 31 × 2 + 1 = 63.
Question 4: What is the next number: 10, 12, 15, 19, 24, ?
- 28
- 29
- 30 (Correct answer)
- 31
Correct answer: 30
Differences increase by 1 each step (2, 3, 4, 5, 6), so 24 + 6 = 30.
Question 5: Complete the series: 64, 32, 16, 8, 4, ?
- 1
- 2 (Correct answer)
- 3
- 4
Correct answer: 2
Each term is halved, so 4 ÷ 2 = 2.
Question 6: What comes next: 7, 14, 12, 24, 22, ?
- 40
- 42
- 44 (Correct answer)
- 48
Correct answer: 44
The pattern alternates ×2 and −2; 22 × 2 = 44.
Question 7: Find the next number: 6, 11, 21, 41, 81, ?
- 121
- 141
- 161 (Correct answer)
- 163
Correct answer: 161
Each term equals (previous × 2) − 1, so 81 × 2 − 1 = 161.
CFAT Problem Solving: Number Series 3
What is the next number: 2, 3, 5, 8, 13, 21, ?