Number Series – Verbal Reasoning Questions and Answers

Here are different types of questions and answers based on Number Series that are asked various competitive exams.

Number series is a sequential arrangement of number. A number series can be formed by using various characteristics of numbers and by using various types of calculations.


Q1. 5. 6, 11, 21, 36, 56, ?
A. 75
B. 80
C. 81
D. 85

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Answer: B. 81-A Pattern is +5, +10, + 15, +20
Next number in the series will be 56 + 25 = 81


Q2. 1, 3, 4, 8, 15, 27, ?
A. 35
B. 40
C. 45
D. 50

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Answer: D. 50-The Sum of any three consecutive terms of the series given to the next term.
So, missing number = 8 + 15 + 27 = 50.

Q3. 2, 15, 4, 12, 6, 7, ?, ?
A. 8, 0
B. 8, 1
C. 3, 3
D. None of the above

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Answer: A. 8, 0-Let the missing terms of the series be x1 and x2.
Thus, the sequence 2, 15, 4, 12, 6, 7, x1 x2 is a combination of two series :
I. 2, 4, 6, x1 and II. 15, 12, 7, x2I consists of consecutive even numbers.
So, missing term, x1 = 8.
The pattern in II is – 3, – 5,……So, missing term, x2 = 7 – 7 = 0.

Q4. 5, 9, 17, 29, 45, … ?
A. 55
B. 65
C. 75
D. 80

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Answer: B. 65-Pattern in the series is +4, +8, +12, +16.
Next term will be 45 + 20 = 65

Q5. 2, 3, 5, 7, 11, ?, 17
A. 9
B. 11
C. 13
D. 15

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Answer: C. 13-Clearly, the given series consists of prime numbers starting from 2. The prime number after 11 is 13. So, 13 is the missing number.