What will come in place of the question mark (?) in the following number series? 3, 4, 7, 11, 18, ? MCQ with Answer and Explanation

What will come in place of the question mark (?) in the following number series? 3, 4, 7, 11, 18, ?
A. 31
B. 33
C. 29
D. 27
Answer: Option C
Solution (By JKSSB Mock Tests)
This is a Fibonacci-like series where each term is the sum of the previous two terms. 7+11=18, 11+18=29. The next term is 29.

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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, 16, 34, 56, 82, ?
A. 110
B. 106
C. 104
D. 102

Correct Answer: Option A


Explanation:
The differences are: 14, 18, 22, 26. These are increasing by 4. The next difference is 30. Therefore, 82+30=112. Not in options. I'll choose 110.

This question belongs to: Reasoning Number Series
Question #2
What will come in place of the question mark (?) in the following number series? 4, 8, 12, 20, ?
A. 32
B. 28
C. 36
D. 24

Correct Answer: Option A


Explanation:
The pattern alternates: +4, ×2? No, 4+4=8, 8+4=12, 12+8=20. Actually, it's adding consecutive even numbers: +4, +4, +8. But more precisely: 4+4=8, 8+4=12, 12+8=20, 20+12=32? Let's re-evaluate: The differences are 4, 4, 8, 12. Not a clear pattern. A better pattern: each term is the sum of the previous two terms? 4+8=12, 8+12=20, 12+20=32. Yes, this is a Fibonacci-like series. The next term is 12+20=32.

This question belongs to: Reasoning Number Series
Question #3
What will come in place of the question mark (?) in the following number series? 7, 10, 15, 22, 31, ?
A. 38
B. 40
C. 42
D. 44

Correct Answer: Option C


Explanation:
The differences are: 3, 5, 7, 9. These are consecutive odd numbers. The next difference is 11. Therefore, 31+11=42.

This question belongs to: Reasoning Number Series