What will come in place of the question mark (?) in the following number series? 4, 8, 12, 20, ? MCQ with Answer and Explanation

What will come in place of the question mark (?) in the following number series? 4, 8, 12, 20, ?
A. 36
B. 28
C. 24
D. 32
Answer: Option D
Solution (By JKExamLibrary)
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.

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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? 14, 27, 42, 59, ?
A. 82
B. 76
C. 78
D. 80

Correct Answer: Option C


Explanation:
The differences are: 13, 15, 17. These are increasing by 2. The next difference is 19. Therefore, 59+19=78.

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? 2, 10, 30, 68, 130, ?
A. 222
B. 210
C. 200
D. 220

Correct Answer: Option A


Explanation:
The pattern is: 1³+1=2, 2³+2=10, 3³+3=30, 4³+4=68, 5³+5=130. The next term is 6³+6=222.

This question belongs to: Reasoning Number Series