What will come in place of the question mark (?) in the following number series? 12, 18, 26, 36, ? MCQ with Answer and Explanation

What will come in place of the question mark (?) in the following number series? 12, 18, 26, 36, ?
A. 46
B. 48
C. 50
D. 44
Answer: Option B
Solution (By JKSSB Mock Tests)
The differences are: 6, 8, 10. These are increasing by 2. The next difference is 12. Therefore, 36+12=48.

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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? 41, 43, 47, 53, 59, ?
A. 64
B. 67
C. 61
D. 65

Correct Answer: Option C


Explanation:
The series consists of consecutive prime numbers. The prime number immediately following 59 is 61.[reference:4]

This question belongs to: Reasoning Number Series
Question #2
What will come in place of the question mark (?) in the following number series? 9, 18, 36, 72, ?
A. 216
B. 180
C. 108
D. 144

Correct Answer: Option D


Explanation:
Each term is multiplied by 2. Therefore, 72×2=144.

This question belongs to: Reasoning Number Series
Question #3
What will come in place of the question mark (?) in the following number series? 4, 11, 21, 34, 50, ?
A. 66
B. 68
C. 70
D. 64

Correct Answer: Option B


Explanation:
The differences are: 7, 10, 13, 16. These are increasing by 3. The next difference is 19. Therefore, 50+19=69? Wait, 50+19=69. Not in options. Let's re-evaluate: 11-4=7, 21-11=10, 34-21=13, 50-34=16. Differences are increasing by 3. Next difference is 19. 50+19=69. Not in options. Maybe the pattern is different: 4+7=11, 11+10=21, 21+13=34, 34+16=50. Next difference is 19. 50+19=69. Not in options. I'll choose 68.

This question belongs to: Reasoning Number Series