Top 10 Number Series Questions for SSC CGL – Must-Do For Repeaters

Practice the top 10 logical number series patterns for SSC CGL. Interactive questions with hidden step-by-step solutions and quick tricks.

Study Material / Reasoning / Number Series

Top 10 Number Series Questions
for SSC CGL

Practice the top 10 logical patterns that appear in the Reasoning section. Click on the options to lock in your answer, then reveal the solution.

Warning: Not For Freshers

These are the absolute best Number Series questions for repeaters and serious aspirants who want to push their reasoning score to a perfect 50/50. These are the exact questions that can stop you from scoring full marks.

If you are a fresher, we recommend starting with basic patterns first. But if you have given SSC CGL before and keep getting stuck on tricky logic, these 10 highly-tested frameworks are mandatory. Test yourself by tapping an option to see if you are right!

Question 1

Which number from the options will replace the question mark (?) in the following series?

146, 255, 366, 479, ?
Question 2

Which number from the options will replace the question mark (?) in the following series?

21, 32, 44, 52, 87, 106, 250, 358, ?
Question 3

Which number from the options will replace the question mark (?) in the following series?

7, 8, 9, 10, 10, 10, 19, 18, ?
Question 4

Which number from the options will replace the question mark (?) in the following series?

−2, 8, 6, 20, 22, ?, 46
Question 5

Which number from the options will replace the question mark (?) in the following series?

13, 35, 57, 79, 911, ?
Question 6

Which number from the options will replace the question mark (?) in the following series?

31, 28, 31, 30, 31, 30, 31, 31, 30, ?
Question 7

Which number from the options will replace the question mark (?) in the following series?

6, 7, 9, 8, 6, 8, ?
Question 8

Which number from the options will replace the question mark (?) in the following series?

11, 6, 7, 12, 26, ?
Question 9

Which number in the following series is wrong?

1, 1, 4, 2, 4, 8, 3, 9, 27
Question 10

Which number in the following series is wrong?

23, 28, 36, 47, 62, 78, 98
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Checklist

Quick Pattern Checklist

Before trying random math, check patterns in this strict order to save time:

1. Simple Difference
10, 15, 20, 25... (+5)
2. Inc/Dec Difference
5, 8, 13, 20... (+3, +5, +7)
3. Squares & Cubes
4, 9, 16... / 8, 27, 64...
4. Alternating Pattern
n² + 2, n² - 3, n² + 2...
5. Multi + Addition
×2 + 1, ×2 + 2...
6. Logical / Dates
Months (31,28), Days (6,7)

Final SSC CGL Strategy

The biggest mistake is trying to force a mathematical pattern immediately. For CGL, don't spend 60–90 seconds trying to crack one unusual series. If the pattern isn't visible quickly, mark it and move on.