Number System For IBPS RRB Exam, Check Practical Questions

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The Number System is a important topic for quantitative section and 3 to 4 question asked in the examination. The Number System is a Mathematical value that contains a number and symbols. As the name suggests Number Series are numbers in some pattern or sequence. Number series can either be missing or wrong and candidates either need to find the wrong or the missing number. In this article we are discussing the Number Series topics Quantitative section 10 Practice Questions with Detailed Solutions and a few tips and tricks as to how to solve such questions. candidates bookmark our article and check start their number system preparation with practical questions and their solutions.

Different Types of Questions Asked in Number Series

Arranging Number
Alternating Series
Square Series
Fibonacci Series
Cube Series
Mixed Operator Series
Multiplication Series
Subtraction Series
Addition Series
Division Series

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Important Question Number Series for IBPS RRB 2024 Exam

Question 1: The following numbers form a series. Find the odd one out.

80, 60, 20, 10, 5, 2.5

A) 80

B) 60

C) 20

D) 10

E) 5

Ans: 2

Solution:

80/2 = 40

40/2 = 20

20/2 = 10

10/2 = 5

5/2 = 2.5

Therefore, 40 should be in place of 60.

Hence, option b.

Question 2: The following numbers form a series. Find the odd one out.

86, 83, 77, 64, 41, -7

A) 64

B) 77

C) 86

D) 83

E) 41

Ans: 1

Solution:

86 – 3 = 83

83 – 6 = 77

77 – 12 = 65

65 – 24 = 41

41 – 48 = -7

Therefore, 65 should be in place of 64.

Hence, option a.

Question 3: The following numbers form a series. Find the odd one out.

9, 10, 14, 23, 40, 64

A) 9

B) 10

C) 14

D) 23

E) None of these

Ans: 5

Solution:

9 + 1² = 9 + 1 = 10

10 + 2² = 10 + 4 = 14

14 + 3² = 14 + 9 = 23

23 + 4² = 23 + 16 = 39

39 + 5² = 39 + 25 = 64

Therefore, 39 should be in place of 40.

Hence, option e.

Question 4: The following numbers form a series. Find the odd one out.

3, 5, 8, 12, 17, 24

A) 8

B) 12

C) 24

D) 5

E) 17

Ans: 3

Solution:

3 + 2 = 5

5 + 3 = 8

8 + 4 = 12

12 + 5 = 17

17 + 6 = 23

Therefore, 23 should be in place of 24.

Hence, option c.

Question 5: The following numbers form a series. Find the odd one out.

1, 3, 7, 15, 30, 63

A) 30

B) 3

C) 7

D) 63

E) 15

Ans: 1

Solution:

1 × 2 + 1 = 3

3 × 2 + 1 = 7

7 × 2 + 1 = 15

15 × 2 + 1 = 31

31 × 2 + 1 = 63

Therefore, 31 should be in place of 30.

Hence, option a.

Question 6: What will come in place of the question mark (?) in the following series?

23, 38, 68, 113, ?, 248

A) 151

B) 162

C) 173

D) 184

E) 155

Ans: 3

Solution:

The series follows the pattern:
23 + 15 × 1 = 38,
38 + 15 × 2 = 68,
68 + 15 × 3 = 113,
113 + 15 × 4 = 173,
173 + 15 × 5 = 248.
Hence, option c.

Question 7: What will come in place of the question mark (?) in the following series?

250, 249, 241, 214, ?, 25

A) 164

B) 150

C) 188

D) 172

E) None of these

Ans: 2

Solution:

The series follows the pattern:
250 – 1³= 249,
249 – 2³ = 241,
241 – 3³= 214,
214 – 4³= 150,
150 – 5³ = 25.
Hence, option b.

Question 8: What will come in place of the question mark (?) in the following series?

140, 150, 170, 210, 290, ?

A) 510

B) 380

C) 540

D) 430

E) 450

Ans: 5

Solution:

The series follows the pattern:

140 + 10 = 150,

150 + 20 = 170,

170 + 40 = 210,

210 + 80 = 290,

290 + 160 = 450.

Hence, option e.

Question 9: What will come in place of the question mark (?) in the following series?

472.5, ?, 105, 60 ,40 , 32

A) 210

B) 240

C) 250

D) 265

E) None of these

Ans: 1

Solution:

The series follows the pattern:
472.5 / 2.25 = 210,
210 / 2 = 105,
105 / 1.75 = 60,
60 / 1.5 = 40,
40 / 1.25 = 32.
Hence, option a.

Question 10: What will come in place of the question mark (?) in the following series?

33, 34, 70, 213, 856, ?

A) 3245

B) 3664

C) 4285

D) 4675

E) 4854

Ans: 3

Solution:The series follows the pattern:
33 × 1 + 1 = 34,
34 × 2 + 2 = 70,
70 × 3 + 3 = 213,
213 × 4 + 4 = 856,
856 × 5 + 5 = 4285.
Hence, option c.

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Number System For IBPS RRB Exam FAQ

What is the number system?

The number system is a writing system for expressing numbers using digits or symbols in a consistent manner. The most common number system is the decimal system, which is based on ten digits (0-9).

What are the different types of number systems?

The primary types of number systems are the decimal (base 10), binary (base 2), octal (base 8), and hexadecimal (base 16) systems.

What is a natural number?

Natural numbers are positive integers starting from 1 and increasing without end (1, 2, 3, …).

Sweta Singh

Hi, I am Sweta Singh (B.Com Honours). I cleared many bank exams time by time but couldn't join because of my passion towards writing. I write blogs to help aspirants prepare for Banking and Insurance exams. These blogs turn out to be a one-stop destination for comprehensive information on some of the biggest competitive exams like SBI PO/Clerk, IBPS PO/Clerk, IBPS RRB PO/Clerk and RBI. My ultimate goal is to provide accurate and easy-to-understand information, covering topics like exam patterns, syllabus, study techniques, and more. Join me on this journey of knowledge!