Number Series is one of the most important topics in the Quantitative Aptitude section of banking exams. Candidates preparing for the IDBI Junior Assistant Manager (JAM) Grade O 2026 Exam must focus on this topic because it is highly scoring and usually requires less time to solve compared to other quantitative topics. In this blog, we will discuss the importance of number series questions, common types asked in exams, solving techniques, and preparation tips for the IDBI JAM Grade O exam.
Download Number Series Questions for IDBI Grade O Exam 2026
In this section, we are providing Number Series Questions. Our experts curate these after analysing previous years’ patterns. Download Now and practice as many questions as you can.
What is a Number Series?
A number series is a sequence of numbers arranged according to a specific pattern or rule. In these questions, one or more numbers in the sequence are missing, and candidates must identify the pattern and find the missing number.
The pattern can involve operations such as:
- Addition
- Subtraction
- Multiplication
- Division
- Squares or cubes
- Combination of multiple operations
Recognizing these patterns quickly is the key to solving number series questions.
Types of Number Series Questions Asked in Banking Exams
Number series questions can appear in different formats. The most common types include the following.
1. Missing Number Series
In this type of question, a sequence is given with one number missing, and candidates must identify the missing value.
Example:
3, 7, 13, 21, ?
Solution:
The pattern is increasing by consecutive even numbers.
3 + 4 = 7
7 + 6 = 13
13 + 8 = 21
21 + 10 = 31
So, the missing number is 31.
2. Wrong Number Series
In this type, one number in the sequence is incorrect. Candidates must identify the number that does not follow the pattern.
Example:
2, 6, 12, 20, 31, 42
Here, the pattern should follow +4, +6, +8, +10, +12, but the number 31 breaks the pattern. The correct value should be 30.
3. Double Pattern Series
Some number series involve two different patterns alternating in the sequence.
Example:
2, 5, 4, 7, 6, 9, ?
Odd positions: 2, 4, 6 → +2 pattern
Even positions: 5, 7, 9 → +2 pattern
So, the next number is 8.
4. Square or Cube-Based Series
Some number series involve squares, cubes, or other mathematical operations.
Example:
1, 4, 9, 16, 25, ?
These numbers are perfect squares.
1², 2², 3², 4², 5²
The next number is 36 (6²).
Tips to Solve Number Series Questions Quickly
Here are some useful tips that can help candidates solve number series questions faster in the IDBI JAM exam.
1. Check the Difference First
The first step is to find the difference between consecutive numbers. Many series follow simple addition or subtraction patterns.
2. Look for Multiplication Patterns
If the difference method does not work, check whether the numbers follow multiplication or division patterns.
3. Check Alternate Patterns
Sometimes the series follows two different patterns simultaneously. Check odd and even positions separately.
4. Observe Squares and Cubes
Many number series involve perfect squares, cubes, or powers. Recognizing these patterns quickly can save time.
5. Practice Regularly
Regular practice helps you recognize patterns faster and improves your calculation speed.
Preparation Strategy for Number Series
To master number series questions for the IDBI JAM Grade O exam, follow this preparation strategy:
- Start by understanding basic patterns such as addition, subtraction, and multiplication.
- Practice different types of number series questions daily.
- Solve previous year questions to understand the exam pattern.
- Attempt sectional quizzes and mock tests regularly.
- Analyze your mistakes and improve weak areas.
Consistency in practice is the key to mastering this topic.
Conclusion
Number series is a simple yet highly scoring topic in the Quantitative Aptitude section of the IDBI JAM Grade O exam. With the right approach and regular practice, candidates can solve these questions quickly and accurately. If you are preparing for the IDBI JAM Grade O 2026 exam, make sure to include number series questions in your daily study routine. With consistent effort and practice, you can easily score well in this section and improve your overall exam performance.
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