Series: Solved 233 Series Questions and answers section with explanation for various online exam preparation, various interviews, Logical Reasoning Category online test. Category Questions section with detailed description, explanation will help you to master the topic.

Series Questions

1. Find the missing series
3, 12, 27, 48, 75, 108, ?




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Correct Ans:147
Explanation:
The pattern is,
3*12 = 3
3*22 = 12
3*32 = 27
3*42 = 48
3*52 = 75
3*62 = 108
3*72 = 147
147 is the missing number.


2. Find the missing series
4.5, 18, 2.25, ? , 1.6875, 33.75




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Correct Ans:27
Explanation:
The pattern is,
4.5*4 = 18
18/8 = 2.25
2.25*12 = 27
27/16 = 1.6875
1.6875*20 = 33.75
27 is the missing number.


3. Find the missing series
2 ,3 , 8 , 63, ?




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Correct Ans:3968
Explanation:
The pattern is,
22 = 4 - 1 = 3
32 = 9 - 1 = 8
82 = 64 - 1 = 63
632 = 3969 - 1 = 3968
3968 is the missing number.


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4. Find the missing series
2, 6, 12, 20, 30, 42, 56, ?




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Correct Ans:72
Explanation:
The pattern is,
1*2 = 2
2*3 = 6
3*4 = 12
4*5 = 20
5*6 = 30
6*7 = 42
7*8 = 56
8*9 = 72
72 is the missing number.


5. Find the missing series
1, 7, 3, 9, 6, 12, 10, 16, 15, ?




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Correct Ans:21
Explanation:
The pattern is,
First series is,
1 + 2 = 3
3 + 3 = 6
6 + 4 = 10
10 + 5 = 15

Second series is,
7 + 2 = 9
9 + 3 = 12
12 + 4 = 16
16 + 5 = 21
21 is the missing number.


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6. Find the missing series
3, 7, 16, 35, ?, 153




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Correct Ans:74
Explanation:
The pattern is,
3*2 + 1 = 7
7*2 + 2 = 16
16*2 + 3 = 35
35*2 + 4 = 74
74*2 + 5 = 153
74 is the missing number.


7. Find the missing series
10, 67, 341, 1369, ?




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Correct Ans:4111
Explanation:
The pattern is,
(10*6) +7 = 67
(67*5) + 6 = 341
(341*4) + 5 = 1369
(1369*3) + 4 = 4111
4111 is the missing number.


8. Find the missing series
13, 21, 48, 112, ?




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Correct Ans:237
Explanation:
The pattern is,
13 + 23 = 21
21 + 33 = 48
48 + 43 = 112
112 + 53 = 237
237 is the missing number.


9. Find the missing series
9, 21, 45, 93, ?, 381




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Correct Ans:189
Explanation:
The pattern is,
9 + 12 = 21
21 + (12*2) = 12 + 24 = 45
45 + (24*2) = 45 + 48 = 93
93 + (48*2) = 93 + 96 = 189
189 + (96*2) = 189 + 192 = 381
189 is the missing number.


10. Find the missing series
520, 1851, 3579, ?, 8520




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Correct Ans:5776
Explanation:
The pattern is,
520 - 1851 = 1331 = 113
1851 - 3579 = 1728 = 123
3579 - 5776 = 2197 = 133
5776 - 8520 = 2744 = 143
5776 is the missing number.


11. Find the missing series
5, 7.5, 12.5, 22.5, ?




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Correct Ans:42.5
Explanation:
The pattern is,
5 * 2 - 2.5 = 7.5
7.5 * 2 - 2.5 = 12.5
12.5 * 2 - 2.5 = 22.5
22.5 * 2 - 2.5 = 42.5
42.5 is the missing number.


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12. Find the missing series
6, 3, 3, 4.5, ?




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Correct Ans:9
Explanation:
The pattern is,
6 * 0.5 = 3
3 * 1 = 3
3 * 1.5 = 4.5
4.5 * 2 = 9
9 is the missing number.


13. Find the missing series
4, 6, 10, 14, 22, 26, 34, 38, 46, ?




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Correct Ans:58
Explanation:
The pattern is,
2*2 = 4
2*3 = 6
2*5 = 10
2*7 = 14
2*11 = 22
2*13 = 26
2*17 = 34
2*19 = 38
2*23 = 46
2*29 = 58
58 is the missing series.


14. Find the missing series
1, 5, 13, 25, ?




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Correct Ans:41
Explanation:
The pattern is,
1 + 4 = 5
5 + 8 = 13
13 + 12 = 25
25 + 16 = 41
41 is the missing series.


15. Find the missing series
5, 4, 10, 8, 15, ?




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Correct Ans:12
Explanation:
The pattern is,
5*1 = 5
4*1 = 4
5*2 = 10
4*2 = 8
5*3 = 15
4*3 = 12
12 is the missing series.


16. Find the missing series
7, 26, 63, 124, 215, 342, ?




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Correct Ans:511
Explanation:
The pattern is,
(23 - 1) = 7
(33 - 1) = 26
(43 - 1) = 63
(53 - 1) = 124
(63 - 1) = 215
(73 - 1) = 342
(83 - 1) = 511
511 is the missing series.


17. Find the missing series
19, 29, 40, 44, ?




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Correct Ans:52
Explanation:
The pattern is,
19 + (1 + 9) = 19 + 10 = 29
29 + (2 + 9) = 29 + 11 = 40
40 + (4 + 0) = 40 + 4 = 44
44 + (4 + 4) = 44 + 8 = 52
52 is the missing series.


18. Find the missing series
2, 3, 7, 22, 155, ?




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Correct Ans:3411
Explanation:
The pattern is,
2*3 + 1 = 7
3*7 + 1 = 22
7*22 + 1 = 155
22*155 + 1 = 3411
3411 is the missing number.


19. If all the digits of the number 47623951, are arranged in ascending order from left to right, then 2 is added to the first four digits of the number and 2 is subtracted to the last four digits of the number. Then how many digits are repeating in the number thus formed?




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Correct Ans:Three
Explanation:
Given: 47623951
After rearrangement: 12345679
Final number: 34563457
Here, the numbers 3, 4, and 5 are repeated twice.


Directions: Study the following numbers carefully and answer the questions given beside:

563 218 732 491 924

Refer the above for the Questions 20 to 20
20. If the first two digits of each number are interchanged then the numbers are arranged in increasing order from left to right then which of the following numbers in the newly formed sequence will be second from right end?




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Correct Ans:563
Explanation:
The given sequence:
563 218 732 491 924
Interchanging first two digits of each number, we get:
653 128 372 941 294
Arranging the numbers in increasing order from left to right, we get:
128 294 372 653 941
Here, the second number from right end in the newly formed sequence is 653.





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