What will come in place of the question mark (?) in the following number series? 3, 7, 15, 31, ? MCQ with Answer and Explanation

Question

Share Report Error

What will come in place of the question mark (?) in the following number series? 3, 7, 15, 31, ?

A. 67

B. 61

C. 63

D. 65

Answer: Option C

Solution (By JKExamLibrary)

Each term is obtained by multiplying by 2 and adding 1. (3×2)+1=7, (7×2)+1=15, (15×2)+1=31. The next term is (31×2)+1=63.

This question belongs to: Reasoning Number Series

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Number Series Questions

Question #1

Share Report

What will come in place of the question mark (?) in the following number series? 4, 9, 19, 39, ?

A. 79

B. 77

C. 83

D. 81

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option A

Explanation:
Each term is obtained by multiplying by 2 and adding 1. (4×2)+1=9, (9×2)+1=19, (19×2)+1=39. The next term is (39×2)+1=79.

This question belongs to: Reasoning Number Series

Question #2

Share Report

What will come in place of the question mark (?) in the following number series? 2, 12, 36, 80, ?

A. 180

B. 160

C. 150

D. 170

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option C

Explanation:
The pattern is: 1×2=2, 2×6=12, 3×12=36, 4×20=80. The multipliers are 2,6,12,20 which are n(n+1) for n=1,2,3,4. For n=5, 5×30=150.

This question belongs to: Reasoning Number Series

Question #3

Share Report

What will come in place of the question mark (?) in the following number series? 6, 18, 54, 162, ?

A. 324

B. 810

C. 648

D. 486

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option D

Explanation:
Each term is multiplied by 3. Therefore, 162×3=486.

This question belongs to: Reasoning Number Series

Explore All Number Series MCQs