Series Completion – Verbal Reasoning Questions and Answers
Last Updated :
03 Jan, 2024
Series Completion Reasoning: Series completion is a type of Verbal Reasoning question that requires you to identify the pattern in a sequence of numbers, letters, or symbols and complete the series by filling in the missing terms. Series completion questions are often found in standardized tests, such as the GMAT, GRE, and SAT, as well as in job interviews and other assessments.
Logical reasoning is the ability to use logic to solve problems and make decisions. It is a crucial skill for success in many different fields, including law, business, and science. Series completion questions test your logical reasoning skills by challenging you to identify patterns and relationships.
With practice, you can learn to solve series completion questions quickly and accurately. This will help you improve your performance on standardized tests and job interviews.
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Series Completion Questions – Solved Examples
1. In the series 2, 6, 18, 54, …… what will be the 8th term?
a) 4370
b) 4374
c) 7443
d) 7434
Answer: b) 4374
Explanation: Each term is obtained by multiplying the previous term by 3. So, to find the 8th term, we continue this pattern: 54 * 3 = 162, 162 * 3 = 486, 486 * 3 = 1458, 1458 * 3 = 4374.
2. What comes next in the series: 5, 10, 20, 40, …?
a) 60
b) 80
c) 100
d) 120
Answer: c) 100
Explanation: Each term is obtained by multiplying the previous term by 2. So, to find the next term, we continue this pattern: 40 * 2 = 80, 80 * 2 = 160, and so on. Therefore, the next term is 40 * 2 = 80.
3. What is the missing number in the series: 3, 8, 15, __, 35?
a) 18
b) 22
c) 24
d) 28
Answer: c) 24
Explanation: The series adds consecutive prime numbers starting from 2: 3 (2+1), 8 (3+5), 15 (5+10), 24 (7+17), 35 (11+24).
4. What comes next in the series: 1, 4, 9, 16, …?
a) 25
b) 30
c) 36
d) 49
Answer: d) 49
Explanation: This series represents perfect squares of consecutive natural numbers: 1 (1^2), 4 (2^2), 9 (3^2), 16 (4^2), and so on. Therefore, the next term is 5^2 = 25.
5. What is the missing number in the series: 2, 5, 11, __, 35, 71?
a) 17
b) 23
c) 29
d) 47
Answer: b) 23
Explanation: The series follows a pattern where each number is doubled and 1 is added. So, to find the missing number, we double 11 and add 1: 11 * 2 + 1 = 23.
6. What comes next in the series: 1, 3, 7, 15, …?
a) 25
b) 27
c) 31
d) 63
Answer: d) 63
Explanation: This series represents a pattern where each number is multiplied by 2 and then 1 is added. So, to find the next term, we double 15 and add 1: 15 * 2 + 1 = 31, and so on.
7. What is the missing number in the series: 12, 22, 32, __, 52, 62?
a) 40
b) 42
c) 45
d) 46
Answer: b) 42
Explanation: The series increases by 10 each time. So, to find the missing number, we add 10 to 32: 32 + 10 = 42.
8. What comes next in the series: 144, 121, 100, 81, …?
a) 64
b) 49
c) 36
d) 25
Answer: a) 64
Explanation: This series represents the squares of consecutive decreasing natural numbers: 12^2 = 144, 11^2 = 121, 10^2 = 100, 9^2 = 81, and so on. Therefore, the next term is 8^2 = 64.
9. What is the missing number in the series: 2, 6, 12, __, 30, 42?
a) 18
b) 20
c) 24
d) 36
Answer: c) 24
Explanation: The series follows a pattern where each number is multiplied by 3, and then 6 is added. So, to find the missing number, we multiply 12 by 3 and add 6: 12 * 3 + 6 = 42.
10. What comes next in the series: 3, 6, 18, 72, …?
a) 216
b) 324
c) 432
d) 648
Answer: d) 648
Explanation: This series represents a pattern where each number is multiplied by 2, and then the result is multiplied by 3. So, to find the next term, we take 72 * 2 * 3 = 432 * 3 = 1296, and so on, making the next term 1296 * 2 * 3 = 648.
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