Number Series For IBPS RRB Exam, Check Practical Questions

The IBPS RRB 2025 exams for both PO (Probationary Officer) and Clerk positions continue to be among the most competitive banking exams in India. A crucial part of the Quantitative Aptitude section in these exams is the Number Series a topic that tests candidates on their pattern recognition and numerical logic skills. This article offers a detailed guide to understanding number series, expert tips for improving accuracy and speed, and a curated set of practice questions to enhance your preparation for the IBPS RRB 2025 exam.

What is Number Series?

A number series is a sequence of numbers that follows a specific rule or pattern. In the IBPS RRB 2025 exam, candidates may be asked to find a missing number in the series or identify the wrong number. To solve these questions, it is important to recognize the pattern used, which may be based on addition, subtraction, multiplication, division, or a mix of operations. These questions test your ability to think logically and quickly spot trends, making them an important part of the Quantitative Aptitude section.

Types of Number Series

1. Missing Number
2. Wrong Number Series

Types of Number Series covered in Missing Number Series Pattern:

Addition Series  

Specific numbers depending on some pattern are added to get the following number in this type of number series.

Subtraction Series

Series is given following a pattern that involves the subtraction of numbers, this subtraction too follows a definite pattern a candidate needs to identify a pattern.

Multiplication Series

The multiplication series is most favorite of the examiner as multiplication is required in different sets of patterns like it may follow the pattern of square roots, cube roots, alternative number multiple

Division Series

In this division series, the said series follows a definite set of divisibility rules which is to be identified to produce the next number in the series.

Wrong Number Series 

The questions in the Series appear to be simple. You have to figure out which one is the odd one out. However, these questions can become rather complicated, and candidates frequently become perplexed.

Method to Solve Number Series Questions

• Observe the given series carefully. Write down the numbers and look for any obvious patterns.
• Find the difference between consecutive terms. Calculate the difference or ratio between each pair of numbers to spot addition, subtraction, multiplication, or division patterns.
• Check for common patterns:
  • Constant difference: Numbers increase or decrease by the same amount.
  • Constant ratio: Numbers are multiplied or divided by the same value.
  • Squares or cubes: Numbers may be perfect squares (1, 4, 9, 16…) or cubes (1, 8, 27…).
  • Alternating patterns: Two or more different patterns alternate in the series.
  • Mixed operations: A combination of addition, subtraction, multiplication, or division.
• Verify the pattern by applying it to all terms. Ensure the identified rule fits the entire series or most of it.
• Find the missing or wrong term. Use the pattern to calculate the missing number or identify the incorrect one.
• Double-check your answer. Reapply the pattern to confirm your solution is correct.
• Number Series Questions for the IBPS RRB Exam

Number Series Questions for IBPS RRB Exam

Q: What will come in place of the question mark?

1. 70, 90, ?, 154, 198, 250

1. 118
2. 119
3. 116
4. 115
5. 117

2.  125, 250, 466, ? , 1321, 2050

1. 706
2. 756
3. 806
4. 809
5. 810

3.  320, 160, 480, 120, 600, ?

1. 200
2. 110
3. 100
4. 105
5. 115

4.  2, 4 11, 37, ?, 771

1. 143
2. 147
3. 153
4. 154
5. 159

5. 51, 56, 63, 74, ?, 104

1. 83
2. 91
3. 77
4. 87
5. 97

6. ?, 14, 31, 97, 393, 1971

1.  266
2. 261
3. 159
4. 238
5. 296

7. 14, 116, 239, 404, 632, ?

1.  230
2. 240
3. 350
4. 450
5. 110

8. 90, 55, 75, 142.5, ?, 862.5

1. 26
2. 27
3. 36
4. 46
5. 19

9. 24, 63, 143, ?, 575, 899

1. 323
2. 224
3. 255
4. 343
5. 360

10. 111, 100, 110, 101, 109, ?

1. 102
2. 100
3. 101
4. 99
5. 105

Find out the wrong number in the series

1. 4, 11, 39, 163, 823, 4947, 34639

1. 11
2. 39
3. 4
4. 823
5. 4947

2. 19, 24, 33, 43, 55, 69, 85

1. 19
2. 24
3. 33
4. 55
5. 85

3 .  36, 34, 22, -8, -64, -154, -286

1. 36
2. 34
3. 22
4. correct
5. -8

4.  3, 8, 17, 36, 73, 146, 297

1. 146
2. 297
3. 3
4. 8
5. 17

5.  0, 1, 9, 36, 81, 225, 441

1. 81
2. 1
3. 9
4. 36
5. 441

6 .  312, 304, 288, 266, 232, 192, 144

1. 312
2. 266
3. 232
4. 192
5. correct

7.  131, 222, 350, 518, 735, 1006

1. correct
2. 350
3. 518
4. 735
5. 1006

8.  5, 13, 36, 145, 719, 4321

1. 36
2. 511
3. 13
4. correct
5. 719

9. 100, 221, 77, 245, 50,275

1. 245
2. 275
3. 77
4. 100
5. correct

10. 27, 36, 51, 68, 87, 110

1. 110
2. 36
3. 51
4. 68
5. 87

 Solutions: