What will come in place of the question mark (?) in the following number series? 1, 1, 2, 3, 5, 8, 13, ? MCQ with Answer and Explanation

What will come in place of the question mark (?) in the following number series? 1, 1, 2, 3, 5, 8, 13, ?
A. 24
B. 18
C. 20
D. 21
Answer: Option D
Solution (By JKExamLibrary)
This is a Fibonacci series where each term is the sum of the previous two terms. 13+8=21.[reference:9]

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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? 3, 9, 19, 33, 51, ?
A. 71
B. 67
C. 73
D. 69

Correct Answer: Option A


Explanation:
The differences are: 6, 10, 14, 18. These are increasing by 4. The next difference is 22. Therefore, 51+22=73.

This question belongs to: Reasoning Number Series
Question #2
What will come in place of the question mark (?) in the following number series? 4, 12, 24, 40, 60, ?
A. 92
B. 80
C. 84
D. 88

Correct Answer: Option C


Explanation:
The differences are: 8, 12, 16, 20. These are increasing by 4. The next difference is 24. Therefore, 60+24=84.

This question belongs to: Reasoning Number Series
Question #3
What will come in place of the question mark (?) in the following number series? 5, 8, 12, 17, ?
A. 21
B. 23
C. 24
D. 22

Correct Answer: Option B


Explanation:
The differences are: 3, 4, 5. The next difference is 6. Therefore, 17+6=23.

This question belongs to: Reasoning Number Series