Number System For IBPS RRB Exam, Check Practical Questions

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 

Tips & Tricks to Solve Number Series

• First and the foremost, candidates must try & look for the given series such as addition, multiplication, subtraction or division etc. 
• Given numbers are then to be arranged in that particular series to get the answer.
• For More preparation candidates take our free topic test and boost your preparation for number system topic.
• Take IBPS RRB Clerk and PO Previous year question paper and know the type of question question asked in the IBPS RRB Clerk and IBPS RRB PO upcoming question paper.

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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