What will come in place of the question mark (?) in the following number series? 4, 6, 9, 13, ? MCQ with Answer and Explanation

What will come in place of the question mark (?) in the following number series? 4, 6, 9, 13, ?
A. 16
B. 17
C. 19
D. 18
Answer: Option D
Solution (By JKSSB Mock Tests)
The differences are: 2, 3, 4. The next difference is 5. Therefore, 13+5=18.

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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? 1, 10, 100, ?
A. 500
B. 1000
C. 2000
D. 10000

Correct Answer: Option B


Explanation:
Each term is multiplied by 10. Therefore, 100×10=1000.

This question belongs to: Reasoning Number Series
Question #2
What will come in place of the question mark (?) in the following number series? 12, 20, 30, 42, ?
A. 54
B. 56
C. 52
D. 58

Correct Answer: Option B


Explanation:
The differences are: 8, 10, 12. These are increasing by 2. The next difference is 14. Therefore, 42+14=56.

This question belongs to: Reasoning Number Series
Question #3
What will come in place of the question mark (?) in the following number series? 4, 8, 12, 20, ?
A. 28
B. 36
C. 32
D. 24

Correct Answer: Option C


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