CFAT Problem Solving: Number Series 2 — Questions and Answers
Question 1: What is the next number in the series: 3, 7, 11, 15, 19, ?
- 21
- 22
- 23 (Correct answer)
- 24
Correct answer: 23
Each term increases by 4, so 19 + 4 = 23.
Question 2: What comes next: 2, 6, 18, 54, ?
- 108
- 162 (Correct answer)
- 216
- 324
Correct answer: 162
Each term is multiplied by 3, so 54 × 3 = 162.
Question 3: Find the missing number: 100, 90, 81, 73, 66, ?
- 58
- 59
- 60 (Correct answer)
- 61
Correct answer: 60
The differences decrease by 1 each step (−10, −9, −8, −7, −6), so 66 − 6 = 60.
Question 4: What is the next term: 1, 4, 9, 16, 25, ?
- 30
- 35
- 36 (Correct answer)
- 49
Correct answer: 36
These are perfect squares (1², 2², 3², 4², 5²), so the next is 6² = 36.
Question 5: Which number comes next: 5, 10, 8, 16, 14, ?
- 12
- 18
- 28 (Correct answer)
- 32
Correct answer: 28
The pattern alternates between ×2 and −2; 14 × 2 = 28.
Question 6: Find the next number: 3, 5, 9, 17, 33, ?
- 49
- 57
- 65 (Correct answer)
- 66
Correct answer: 65
Each term equals (previous × 2) − 1, so 33 × 2 − 1 = 65.
Question 7: What comes next in the sequence: 1, 2, 4, 7, 11, 16, ?
- 20
- 21
- 22 (Correct answer)
- 23
Correct answer: 22
Differences between terms are 1, 2, 3, 4, 5, 6 — the next difference is 6, giving 16 + 6 = 22.
CFAT Problem Solving: Number Series 2
What is the next number in the series: 3, 7, 11, 15, 19, ?