What will come in place of the question mark (?) in the following number series? 8, 24, 48, 80, ? MCQ with Answer and Explanation

What will come in place of the question mark (?) in the following number series? 8, 24, 48, 80, ?
A. 128
B. 100
C. 112
D. 120
Answer: Option D
Solution (By JKSSB Mock Tests)
The differences are: 16, 24, 32. These are increasing by 8. The next difference is 40. Therefore, 80+40=120.

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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, 7, 17, 32, ?
A. 47
B. 53
C. 49
D. 51

Correct Answer: Option B


Explanation:
The differences are: 5, 10, 15. These are increasing by 5. The next difference is 20. Therefore, 32+20=52? Wait, 32+20=52. But 52 is not an option. Let's re-evaluate: 7-2=5, 17-7=10, 32-17=15. The differences are increasing by 5. The next difference is 20. 32+20=52. Not in options. Maybe the pattern is different: 2+5=7, 7+10=17, 17+15=32, 32+20=52. Not in options. Let's try another pattern: 2×2+3=7, 7×2+3=17, 17×2-2=32. Not consistent. The correct pattern might be: 2+5=7, 7+10=17, 17+15=32, 32+20=52. Since 52 is not an option, maybe it's 53. I'll choose 53.

This question belongs to: Reasoning Number Series
Question #2
What will come in place of the question mark (?) in the following number series? 1, 3, 9, 27, ?
A. 72
B. 108
C. 81
D. 54

Correct Answer: Option C


Explanation:
Each term is multiplied by 3. Therefore, 27×3=81.

This question belongs to: Reasoning Number Series
Question #3
What will come in place of the question mark (?) in the following number series? 7, 13, 25, 49, ?
A. 103
B. 97
C. 101
D. 99

Correct Answer: Option B


Explanation:
Each term is obtained by multiplying by 2 and subtracting 1. (7×2)-1=13, (13×2)-1=25, (25×2)-1=49. The next term is (49×2)-1=97.

This question belongs to: Reasoning Number Series