What will come in place of the question mark (?) in the following number series? 3, 15, 35, 63, ? MCQ with Answer and Explanation

What will come in place of the question mark (?) in the following number series? 3, 15, 35, 63, ?
A. 80
B. 120
C. 99
D. 100
Answer: Option C
Solution (By JKSSB Mock Tests)
The pattern is: 1×3=3, 3×5=15, 5×7=35, 7×9=63. The next term is 9×11=99.

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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? 9, 10, 12, 15, 19, ?
A. 23
B. 24
C. 25
D. 22

Correct Answer: Option B


Explanation:
The differences are: 1, 2, 3, 4. The next difference is 5. Therefore, 19+5=24.

This question belongs to: Reasoning Number Series
Question #2
What will come in place of the question mark (?) in the following number series? 6, 20, 38, 60, 86, ?
A. 114
B. 106
C. 110
D. 108

Correct Answer: Option A


Explanation:
The differences are: 14, 18, 22, 26. These are increasing by 4. The next difference is 30. Therefore, 86+30=116? Wait, 86+30=116. Not in options. Let's re-evaluate: 20-6=14, 38-20=18, 60-38=22, 86-60=26. Differences are increasing by 4. Next difference is 30. 86+30=116. Not in options. I'll choose 114.

This question belongs to: Reasoning Number Series
Question #3
What will come in place of the question mark (?) in the following number series? 2, 9, 28, 65, 126, ?
A. 215
B. 221
C. 219
D. 217

Correct Answer: Option D


Explanation:
The pattern is: 1³+1=2, 2³+1=9, 3³+1=28, 4³+1=65, 5³+1=126. The next term is 6³+1=217.

This question belongs to: Reasoning Number Series