Questions and Solved Examples on Number Series
Q.1: Look at this series: 2, 1, (1/2), (1/4), ... What number should come next?
A. (1/3)
B. (1/8)
C. (2/8)
D. (1/16)
Answer: B. (1/8)
Explanation: This is an example of division series; where each successive number is one-half of the previous number.
4/2 = 2; 2/2 = 1; 1/2 = 1/2; (1/2)/2 = 1/4; (1/4)/2 = 1/8 and so on.
Q.2: Look at this series: 7, 10, 8, 11, 9, 12, ... What number should come next?
A. 7
B. 10
C. 12
D. 13
Answer: B. 10
Explanation: This is an example of alternating addition and subtraction series. In the first pattern, 3 is added; in the second, 2 is subtracted and so on.
Number Series – Basic Concepts, Formulas, Math Tricks, Quantitative Aptitude Questions and Solutions (Part 1 in Hindi)
Q.3: Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?
A. 4.2
B. 4.4
C. 4.7
D. 5.1
Answer: C. 4.7
Explanation: Watch the Number Series (Part I) Video
Q.4: Look at this series: 14, 28, 20, 40, 32, 64, ... What number should come next?
A. 52
B. 56
C. 96
D. 128
Answer: B. 56
Explanation: Watch the Number Series (Part I) Video
Quantitative Aptitude Test and Logical Reasoning Preparation App
Quantitative Aptitude Test and Logical Reasoning Preparation App for Bank Exams, SSC CGL Exams, Entrance Exams and Job Interviews
More than 1000+ Detailed Practice Question and Solutions
Download the Free Android App Now – Click on the link below!
Q.5: Look at this series: 53, 53, 40, 40, 27, 27, ... What number should come next?
A. 10
B. 14
C. 40
D. 53
Answer: B. 14
Explanation: Watch the Number Series (Part I) Video
Q.6: Look at this series: 3, 4, 7, 8, 11, 12, ... What number should come next?
A. 7
B. 10
C. 14
D. 15
Answer: D. 15
Explanation: This is an example of alternating addition series. In the first pattern, 1 is added; in the second, 3 is added and so on.
Number Series – Basic Concepts, Formulas, Math Tricks, Quantitative Aptitude Questions and Solutions (Part 2 in Hindi)
Q.7: Look at this series: 31, 29, 24, 22, 17, ... What number should come next?
A. 15
B. 14
C. 13
D. 12
Answer: A. 15
Explanation: This is an example of alternating subtraction series. In the first pattern, 2 is subtracted; in the second, 5 is subtracted and so on.
Q.8: Look at this series: 22, 21, 23, 22, 24, 23, ... What number should come next?
A. 22
B. 24
C. 25
D. 26
Answer: C. 25
Explanation: This is an example of alternating subtraction and addition series. In the first pattern, 1 is subtracted; in the second, 2 is added and so on.
SSC CGL Exam Prep & Mock Tests
Boost your SSC CGL, SSC CHSL, SSC JE and SSC MTS Exam Preparation and Score Better!
More than 1200+ Detailed Practice Question and Solutions
Download the Free Android App Now – Click on the link below!
Q.9: Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should come next?
A. 14
B. 15
C. 21
D. 23
Answer: B. 15
Explanation: This is an example of alternative addition number series with a random number 21, interpolated as every other number. In the series, 2 is added to each number except 21, to arrive at the next number.
Q.10: Look at this series: 8, 22, 8, 28, 8, ... What number should come next?
A. 8
B. 28
C. 30
D. 34
Answer: D. 34
Explanation: This is an example of addition series with a random number 8, interpolated as every other number. In the series, 6 is added to each number except 8, to arrive at the next number.
Q.11: Look at this series: 36, 34, 30, 28, 24, ... What number should come next?
A. 20
B. 22
C. 23
D. 26
Answer: B. 22
Explanation: This is an example of Subtraction Number Series. -2 and -4 is followed.
Q.12: Look at this series: 58, 52, 46, 40, 34, ... What number should come next?
A. 26
B. 28
C. 30
D. 32
Answer: B. 28
Explanation: This is an example of simple Subtraction Number Series. -6 is followed.
Q.13: Look at this series: 201, 202, 204, 207, ... What number should come next?
A. 205
B. 208
C. 210
D. 211
Answer: D. 211
Explanation: This is an example of successive Addition Number Series. +1, +2, +3, +4 is followed.
Q.14: Look at this series: 544, 509, 474, 439, ... What number should come next?
A. 404
B. 414
C. 420
D. 445
Answer: A. 404
Explanation: This is an example of simple Subtraction Number Series. -35 is followed.
Q.15: Look at this series: 1,000, 200, 40, ... What number should come next?
A. 8
B. 10
C. 15
D. 20
Answer: A. 8
Explanation: This is an example of Multiplication Number Series. 1000 is 5 times of 200. And 200 is 5 times of 40. Similarly, 40 is 5 times of 8.
Q.16: Look at this series: 4, ..., 14, 40, 88, 170. What number should come next?
A. 6
B. 8
C. 10
D. 12
Answer: A. 6
Explanation: Watch the Number Series (Part II) Video
Q.17: Look at this series: 6, 6, 7, ..., 91, 463. What number should come next?
A. 25
B. 33
C. 38
D. 43
Answer: A. 25
Explanation: Watch the Number Series (Part II) Video
Q.18: Look at this series: 2, 5, 17, 50, 122, ... What number should come next?
A. 225
B. 242
C. 252
D. 257
Answer: D. 257
Explanation: Watch the Number Series (Part II) Video
Q.19: Look at this series: 4, 4, 6, 12, 30, ... What number should come next?
A. 90
B. 92
C. 95
D. 98
Answer: A. 90
Explanation: Watch the Number Series (Part II) Video
Q.20: Look at this series: 1, 2, 6, 17, ..., 157.5. What number should come next?
A. 40.5
B. 42.5
C. 49.5
D. 50.5
Answer: C. 49.5
Explanation: Watch the Number Series (Part II) Video