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SBI PO Number Series Mostly Asked Questions are an important part of the Quantitative Aptitude section and often help candidates secure quick marks in the examination. Many aspirants struggle with identifying patterns, but regular practice of the most frequently asked questions can make this topic much easier. Whether the series is based on addition, subtraction, multiplication, squares, cubes, or mixed patterns, understanding the logic behind them is the key to success. In this article, you will find SBI PO Number Series Mostly Asked Questions, a practice quiz, a free PDF download section, and answers to common doubts that candidates have while preparing for the SBI PO exam.

Attempt SBI PO Number Series Mostly Asked Questions Quiz

If you want to improve your speed and accuracy in the Quantitative Aptitude section, you should regularly practice SBI PO Number Series Mostly Asked Questions. Attempt the quiz below to check your understanding of different number series patterns and evaluate your preparation level. Solving quiz questions consistently will help you identify common trends and strengthen your problem-solving skills for the actual examination.

Number Series Aptitude Quiz Score: 0.00

Q1. What will come in place of the question mark (?) in the following number series?

5, 4, 6, 15, 56, ?

Explanation: Multiply and then subtract the same number.
5 x 1 – 1 = 4
4 x 2 – 2 = 6
6 x 3 – 3 = 15
15 x 4 – 4 = 56
56 x 5 – 5 = 275

Q2. What will come in place of the question mark (?) in the following number series?

2, 4, 12, 16, 80, ?

Explanation: The pattern switches between addition and multiplication in increasing order.
2 + 2 = 4
4 x 3 = 12
12 + 4 = 16
16 x 5 = 80
80 + 6 = 86

Q3. What will come in place of the question mark (?) in the following number series?

15, 16, 24, 51, 115, ?

Explanation: Find the differences between the numbers: 1, 8, 27, 64. These are cubes of natural numbers (1x1x1, 2x2x2, 3x3x3, 4x4x4).
The next difference will be 5x5x5 = 125.
So, 115 + 125 = 240.

Q4. What will come in place of the question mark (?) in the following number series?

12, 7, 9, 16.5, 37, ?

Explanation: Multiply by increasing halves, then add an increasing whole number.
12 x 0.5 + 1 = 7
7 x 1 + 2 = 9
9 x 1.5 + 3 = 16.5
16.5 x 2 + 4 = 37
37 x 2.5 + 5 = 97.5

Q5. What will come in place of the question mark (?) in the following number series?

5, 15, 30, 55, 95, ?

Explanation: The differences between numbers are: 10, 15, 25, 40.
The gap between those differences grows by 5 each time: 5, 10, 15…
So the next gap is 20, making the next difference 60 (40 + 20).
Finally, 95 + 60 = 155.

Q6. Find the wrong number in the following series.

10, 14, 23, 48, 95, 218

Explanation: The differences should be squares of prime numbers: 4, 9, 25, 49, 121 (which are 2 squared, 3 squared, 5 squared, 7 squared, 11 squared).
If we add 49 to 48, it should be 97 (not 95).
Then 97 + 121 gives the last number, 218. So 95 is wrong.

Q7. Find the wrong number in the following series.

4, 9, 20, 43, 90, 186

Explanation: The rule is to multiply by 2 and add increasing numbers.
4 x 2 + 1 = 9
9 x 2 + 2 = 20
20 x 2 + 3 = 43
43 x 2 + 4 = 90
90 x 2 + 5 = 185. Therefore, 186 is wrong.

Q8. Find the wrong number in the following series.

200, 98, 48, 21.5, 8.75

Explanation: The pattern is to divide by 2, then subtract 2.
(200 / 2) – 2 = 98
(98 / 2) – 2 = 47. Here, 48 is given which is incorrect.
Let’s check the next one: (47 / 2) – 2 = 21.5. This fits perfectly.

Q9. Find the wrong number in the following series.

2, 2, 6, 32, 210, 1890

Explanation: Multiply by increasing odd numbers: 1, 3, 5, 7, 9.
2 x 1 = 2
2 x 3 = 6
6 x 5 = 30 (Not 32!)
30 x 7 = 210
210 x 9 = 1890. So, 32 is wrong.

Q10. Find the wrong number in the following series.

10, 10, 13, 22, 36, 60

Explanation: The differences between the numbers follow this pattern: (Number x Number) – 1. (0, 3, 8, 15, 24).
10 + 0 = 10
10 + 3 = 13
13 + 8 = 21 (Not 22!)
21 + 15 = 36
36 + 24 = 60. So, 22 is wrong.

Quiz Summary

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Final Score: 0.00

Download SBI PO Number Series Mostly Asked Questions PDF

Candidates looking for a reliable revision resource can download the SBI PO Number Series Mostly Asked Questions PDF from the link below. The PDF contains important number series questions, exam-oriented practice sets, and detailed solutions to help you prepare effectively. Regular revision through the PDF can improve concept clarity and increase confidence before the SBI PO examination.

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FAQs on SBI PO Number Series

What are SBI PO Number Series Mostly Asked Questions?

SBI PO Number Series Mostly Asked Questions are the types of number series problems that are repeatedly asked in SBI PO and other banking examinations. These questions test a candidate’s ability to recognize patterns and identify the missing or incorrect number in a sequence.

Why should I practice SBI PO Number Series Mostly Asked Questions?

Practicing SBI PO Number Series Mostly Asked Questions helps improve calculation speed, pattern recognition, and accuracy. Since number series questions are generally less time-consuming than many other quantitative topics, they can contribute significantly to your overall score.

Which number series patterns are commonly asked in SBI PO?

The most common patterns include arithmetic progression, geometric progression, square series, cube series, alternating series, difference-based series, and mixed-operation series. Candidates should be familiar with all these patterns to perform well in the examination.

Is the SBI PO Number Series Mostly Asked Questions PDF useful for revision?

Yes, the SBI PO Number Series Mostly Asked Questions PDF is highly useful for revision because it compiles important practice questions and solutions in one place. It allows candidates to revise quickly and practice even when they are short on time.

How can I improve my performance in SBI PO Number Series questions?

To improve your performance, practice number series questions daily, learn common patterns, analyze mistakes, and attempt mock tests regularly. Consistent practice of SBI PO Number Series Mostly Asked Questions can help you solve questions faster and more accurately in the actual exam.

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By Abhishek Jatariya

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