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
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