What will come in place of the question mark (?) in the following number series? 4, 10, 20, 34, ? MCQ with Answer and Explanation

What will come in place of the question mark (?) in the following number series? 4, 10, 20, 34, ?
A. 50
B. 48
C. 52
D. 54
Answer: Option C
Solution (By JKExamLibrary)
The differences are: 6, 10, 14. These are increasing by 4. The next difference is 18. Therefore, 34+18=52.

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Practice More Number Series Questions

Question #1
What will come in place of the question mark (?) in the following number series? 2, 6, 14, 30, 62, ?
A. 120
B. 122
C. 126
D. 118

Correct Answer: Option C


Explanation:
Each term is obtained by multiplying by 2 and adding 2. (2×2)+2=6, (6×2)+2=14, (14×2)+2=30, (30×2)+2=62. The next term is (62×2)+2=126.

This question belongs to: Reasoning Number Series
Question #2
What will come in place of the question mark (?) in the following number series? 4, 16, 36, 64, ?
A. 121
B. 81
C. 144
D. 100

Correct Answer: Option D


Explanation:
The series consists of squares of even numbers: 2², 4², 6², 8². The next term is 10²=100.

This question belongs to: Reasoning Number Series
Question #3
What will come in place of the question mark (?) in the following number series? 7, 11, 13, 17, 19, 23, ?
A. 29
B. 27
C. 18
D. 28

Correct Answer: Option A


Explanation:
The series consists of consecutive prime numbers starting from 7: 7, 11, 13, 17, 19, 23, 29. Therefore, the next prime number after 23 is 29.[reference:3]

This question belongs to: Reasoning Number Series