CogAT CogAT Quantitative Number Series 2 — Questions and Answers
Question 1: What number comes next in the series: 2, 5, 8, 11, __?
- 13
- 14 (Correct answer)
- 15
- 16
Correct answer: 14
Each number increases by 3, so after 11 comes 14.
Question 2: What number comes next in the series: 81, 27, 9, 3, __?
- 1 (Correct answer)
- 2
- 0
- 3
Correct answer: 1
Each number is divided by 3, so 3 ÷ 3 = 1.
Question 3: What number comes next in the series: 7, 14, 21, 28, __?
- 32
- 33
- 35 (Correct answer)
- 36
Correct answer: 35
These are multiples of 7, so after 28 (7×4) comes 35 (7×5).
Question 4: What number comes next in the series: 2, 3, 5, 7, 11, 13, __?
- 15
- 16
- 17 (Correct answer)
- 19
Correct answer: 17
These are prime numbers in order, and the next prime after 13 is 17.
Question 5: What number comes next in the series: 50, 44, 38, 32, __?
- 24
- 25
- 26 (Correct answer)
- 28
Correct answer: 26
Each number decreases by 6, so after 32 comes 26.
Question 6: What number comes next in the series: 1, 8, 27, 64, __?
- 100
- 121
- 125 (Correct answer)
- 144
Correct answer: 125
These are perfect cubes (1³, 2³, 3³, 4³), so the next is 5³ = 125.
CogAT CogAT Quantitative Number Series 2
What number comes next in the series: 2, 5, 8, 11, __?