#### Table of contents

### Types of questions asked

- Finding missing terms.
- Find the wrong term.
- Prime number series.
- Addition series.
- Subtraction series.
- Multiplication series.
- Division series.
- Mixed
- Series of series

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### Practice Questions

**1. 4,8, , 32,64.**

a. 16

b. 12

c. 18

d. 24

**2. 5, 10, 23, 26, 37,50 (find the wrong term).**

a. 23

b. 5

c. 37

d. 50

**3. 7, 11, 13, 15, 19, 23 : find the wrong term.**

a. 11

b. 13

c. 15

d. 7

**4. 4,9,25,49,121,169…… : find next term.**

a. 289

b. 361

c. 441

d. 529

**5. 3,6,9,12,15, , 21**

a. 17

b. 18

c. 19

d. 20

**6. 56, 58, 62, 70, 84, 118, 182 : find the wrong term.**

a. 58

b. 62

c. 84

d. 118

**7. 2,6,30,210, _ , 30030 (UPSC 2012).**

a. 2200

b. 2730

c. 2310

d. 2100

**8. 2,10,50,260,1250,6250 : wrong term.**

a. 50

b. 260

c. 1250

d. 6250

**9. Look at this series: 7, 10, 8, 11, 9, 12, ... what number should come next?**

a. 7

b. 10

c. 13

d. 12

**10. Look at this series: 36, 34, 30, 28, 24, ... what number should come next?**

a. 20

b. 22

c. 23

d. 26

**11. Look at this series: 22, 21, 23, 22, 24, 23, ... what number should come next?**

a. 22

b. 24

c. 25

d. 26

**12. Look at this series: 80, 10, 70, 15, 60, ... what number should come next?**

a. 20

b. 25

c. 30

d. 50

**13. Consider the sequence given below: 4/12/95, 1/1/96, 29/1/96, 26/2/96, .... The next term of the series is (UPSC 2018)**

a. 24/3/96

b. 25/3/96

c. 26/3/96

d. 27/3/96

**14. What is X in the sequence 132, 129, 124, 117, 106, 93, X? (UPSC 2019)**

a. 74

b. 75

c. 76

d. 77

**15. What is X in the sequence 4, 196, 16, 144, 36, 100, 64, X? (UPSC 2019)**

a. 48

b. 64

c. 125

d. 256

**16. Consider the following sequence that follows some arrangement:
c_accaa_aa_bc_b (UPSC 2019)
The letters that appear in the gaps are**

a. abba

b. cbbb

c. bbbb

d. cccc

**17. Consider the following arrangement that has some missing letters:
abab_b_bcb_dcdcded_d (UPSC 2020)
The missing letters which complete the arrangement are**

a. a, b, c, d

b. a, b, d, e

c. a, c, c, e

d. b, c, d, e

**18. Considering the following sequence of numbers:
5 1 4 7 3 9 8 5 7 2 6 3 1 5 8 6 3 8 5 2 2 4 3 4 9 6 (UPSC 2020)
How many odd numbers are followed by the odd number in the above sequence?**

a. 5

b. 6

c. 7

d. 8

**19. In the series b_a_ba_b_abab_aab; fill in the six blanks () using one of the following given four choices such that the series follows a specific order. (UPSC 2021)**

a. bababa

b. baabba

c. bbaabb

d. ababab

**20. In the series AABABCABCDABCDE……
Which letter occupies the 100th position? (UPSC 2022)**

a. H

b. I

c. J

d. K

**To view the answer keys, register yourself at UPSCprep.com**

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