In the following questions, a series of numbers or alphabetical letter are given which contain a certain pattern.
You are required to recognise this pattern and choose your answer correctly from the given options.
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1. |
1, 4, 9, 16, 25, ?
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A.
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49
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B.
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36
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C.
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64 |
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D.
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41
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View Answer
The series follows pattern: 12, 22, 32, 42, 52, 62
Hence, option (B) is the correct answer.
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2. |
6, 11, 21, 36, 56, ? |
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A.
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81
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B.
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71
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C.
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91 |
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D.
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76
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View Answer
The series follow the pattern: +5, +10,+15,+20 .....
6 + 5 = 11
11 + 10 = 21
21 + 15 = 36
36 + 20 = 56
56 + 25 = 81
Hence, option (A) is the correct answer.
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3. |
1, 6, 13, 22, 33, ?
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A.
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55
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B.
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44
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C.
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48 |
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D.
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46
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View Answer
The series follows the pattern: +5, +7, +9, +11,....
1 + 5 = 6
6 + 7 = 13
13 + 9 = 22
22 + 11 = 33
33 + 13 = 46
Hence, option (D) is the correct answer.
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4. |
Find the missing term: 1, 6, 15, ?, 45, 66, 91 |
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A.
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25
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B.
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26
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C.
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28 |
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D.
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30
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View Answer
The series follows the pattern: +5, +9, + ,_ _ _, +17, +21, +25
Therefore, the missing term =15 + 13 = 28
Hence, option (C) is the correct answer.
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5. |
3, 7, 15, 31, 63, ? |
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A.
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127
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B.
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130
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C.
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125 |
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D.
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123
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View Answer
Here in the series, each next number is achieved by multiplying by 2 and then adding by 1 the previous number.
Therefore, (3 × 2) + 1 = 7
(3 × 2) + 1 = 7
(7 × 2) + 1 = 15
(15 × 2) + 1 = 31
(31 × 2) + 1 = 63
(63 × 2) + 1 = 127
Hence, option (A) is the correct answer.
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6. |
121, 225, 361, ?
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A.
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484
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B.
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625
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C.
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729 |
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D.
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529
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View Answer
The series follows pattern of: 112, (11 + 4 × 1)2, (11 + 4 × 2)2, ....
The missing term is: (11 + 4 × 3)2= (23)2= 529
Hence, option (A) is the correct answer.
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7. |
19, 2, 38, 3, 114, 4, ?
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A.
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556
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B.
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446
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C.
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456 |
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D.
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356
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View Answer
The given series is a combination of two series: 19, 38, 114, ... and second one : 2, 3, 4,...
The pattern follows:
19 × 2 = 38
38 × 3 = 114
114 × 4 = 456
Hence, option (C) is the correct answer.
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8. |
1, 2, 3, 6, 9, 18, 27, 54, ?
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A.
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91
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B.
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81
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C.
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25 |
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D.
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162
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View Answer
The series follows the pattern: The numbers are alternately multipled by 2 and 3/2
1 × 2 = 2
2 × 3/2 = 3
3 × 2 = 6
6 × 3/2 = 9
9 × 2 = 18
18 × 3/2 = 27
27 × 2 = 54
54 × 3/2 = 81
Hence, option (B) is the correct answer.
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9. |
66, 36, 18, ?
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A.
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6
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B.
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12
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C.
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10 |
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D.
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8
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View Answer
The series follows the pattern: Each number in the series is the product of the digits of the preceding number.
6 × 6 = 36
3 × 6 = 18
8 × 1 = 8
. Hence, option (D) is the correct answer.
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10. |
21, 25, 33, 49, 81, ?
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A.
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145
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B.
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135
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C.
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155 |
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D.
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140
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View Answer
The series follows the pattern: +4, +8, +16, +32,... i.e. 22, 23, 24, 25, ...
Therefore, the series is:
21 + 22 = 25
25 + 23 = 33
33 + 24 = 49
49 + 25 = 81
81 + 26 = 145
Hence, option (A) is the correct answer.
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