**Series Completion Reasoning** questions are an important part of the **quantitative aptitude section** in different exams.

**Series Completion Reasoning** Problems are asked in exams like:

- Banking Exams
- UPSC
- Banking Exams
- UPSC

Start your preparation by solving these questions. In this blog, we will go over the fundamentals of **Series Completion Reasoning** problems, as well as the types of questions asked in previous year exams and how to approach them. This will help you clear your basics and answer these** Series Completion Reasoning** questions.

## What is Series Completion?

Series completion entails identifying the hidden pattern or rule governing a sequence and using that pattern to predict the next element. These sequences can encompass numerical patterns, alphabetical patterns, or a combination of both.

Series patterns come in various forms, each requiring a distinct approach. Some common types include:

**Arithmetic Series:**In this type, the difference between consecutive terms follows a constant pattern. For instance, 2, 4, 6, 8, 10 is an arithmetic series with a common difference of 2.**Geometric Series:**Here, the ratio between consecutive terms remains constant. For example, 3, 6, 12, 24, and 48 is a geometric series with a common ratio of 2.**Alphabetical Series:**In alphabetical series completion, you identify the pattern among letters, considering their positions in the alphabet. For instance, A, C, E, G, I follow a pattern of skipping one letter in the alphabet.**Mixed Series:**These series combine numerical and alphabetical patterns. Solving them requires simultaneously recognising both types of patterns.

## Series Completion Reasoning Questions

**1. Pick the correct option for the following series- 3, 6, 9, 12, 15,?**

(1) 20

(2) 17

(3) 18

(4) 21**Answer:** 18

**2. Pick the correct option for the following series- P, R, T, V,?**

(1) Q

(2) L

(3) M

(4) X**Answer: **X

**3. Pick the correct option for the following series- 4, 8, 16, 32,?**

(1) 26

(2) 28

(3) 36

(4) 64**Answer**: 64

**4. Pick the correct option for the following series- F, H, J, L,?**

(1) A

(2) M

(3) N

(4) O**Answer:** N

**5. Pick the correct option for the following series- 5, 10, 20, 40,?**

(1) 30

(2) 42

(3) 45

(4) 80**Answer:** 80

**6. Pick the correct option for the following series- 18, 21, 24, 27,?**

(1) 29

(2) 30

(3) 31

(4) 32

Answer: 30

**7. Pick the correct option for the following series- G, I, K, M,?**

(1) O

(2) N

(3) L

(4) Y**Answer:** O

**8. Pick the correct option for the following series- 6, 12, 18, 24,?**

(1) 30

(2) 26

(3) 28

(4) 33**Answer:** 30

**9. Pick the correct option for the following series- Z, X, V, T,?**

(1) W

(2) R

(3) Q

(4) S**Answer:** R

**10. Pick the correct option for the following series- 7, 14, 21, 28,?**

(1) 30

(2) 35

(3) 37

(4) 40**Answer:** 35

**Also Read:** **20+ Questions of Cause and Effect Reasoning**

**11. Pick the correct option for the following series- B, D, F, H,?**

(1) Q

(2) I

(3) J

(4) K**Answer:** J

**12. Pick the correct option for the following series- 1, 4, 9, 16,?**

(1) 18

(2) 20

(3) 25

(4) 27**Answer:** 25

**13. Pick the correct option for the following series- K, L, M, N,?**

(1) O

(2) P

(3) Q

(4) R**Answer:** O

**14. Pick the correct option for the following series- 11, 22, 33, 44,?**

(1) 55

(2) 50

(3) 66

(4) 65**Answer:** 55

**15. Pick the correct option for the following series- S, U, W, Y,?**

(1) Z

(2) A

(3) B

(4) C**Answer:** A

**16. Pick the correct option for the following series- 2, 3, 5, 7,?**

(1) 9

(2) 12

(3) 11

(4) 10**Answer:** 11

**17. Pick the correct option for the following series- E, J, O, T,?**

(1) Q

(2) R

(3) S

(4) Y**Answer:** Y

**18. Pick the correct option for the following series- 8, 16, 32, 64,?**

(1) 128

(2) 74

(3) 112

(4) 164**Answer:** 128

**19. Pick the correct option for the following series- R, U, X, A,?**

(1) B

(2) C

(3) D

(4) T**Answer:** D

**20. Pick the correct option for the following series- 10, 20, 30, 40,?**

(1) 45

(2) 40

(3) 55

(4) 60**Answer:** 50

**21. Pick the correct option for the following series- 12, 11, 13, 10,?**

(1) 12

(2) 14

(3) 16

(4) 18**Answer:** 14

**22. Pick the correct option for the following series- I, III, V, VII,?**

(1) VIII

(2) X

(3) IX

(4) XI**Answer:** IX

**23. Pick the correct option for the following series- 3, 7, 15, 31,?**

(1) 33

(2) 40

(3) 51

(4) 63**Answer:** 63

**24. Pick the correct option for the following series- Q, P, O, N,?**

(1) M

(2) S

(3) T

(4) U**Answer:** M

**25. Pick the correct option for the following series- 9, 12, 15, 18,?**

(1) 20

(2) 22

(3) 21

(4) 19**Answer:** 21

**26. 120, 99, 80, 63, 48…?**

(1) 35

(2) 38

(3) 39

(4) 40**Answer:** 35

**27. Find the number in the series 7, 12, 19, ?, 39.**

(1) 29

(2) 28

(3) 26

(4) 24**Answer:** 28

**28. In the series 2, 6, 18, 54, …… what will be the 8th term?**

(1) 4370

(2) 4374

(3) 7443

(4) 7434**Answer:** 4374

**29. 1, 2, 3, 6, 9, 18, ?, 54**

(1) 18

(2) 27

(3) 36

(4) 81

Answer: 27

## Tips for Solving Series Completion Questions

Here are some tips for solving completing questions:

**Analyse the Given Series:**Begin by carefully analyzing the provided series. Look for numerical or alphabetical patterns and try to identify any deviations from these patterns.**Identify the Series Type:**Determine whether the series follows an arithmetic, geometric, alphabetical, or mixed pattern. This identification is crucial for making accurate predictions.**Look for Deviations:**Pay close attention to any irregularities or deviations in the series, as they may hold the key to understanding the pattern.**Apply Logic:**Use logical reasoning to deduce the pattern’s rules. Ask yourself questions like, “What is changing from one term to the next?” or “Is there a consistent mathematical operation occurring?”**Practice Regularly:**Series completion is a skill that improves with practice. The more series of patterns you explore, the better you become at recognizing and solving them.

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