What will come in place of the question mark (?) in the following number series? 4, 6, 9, 13, ? MCQ with Answer and Explanation

What will come in place of the question mark (?) in the following number series? 4, 6, 9, 13, ?
A. 18
B. 16
C. 19
D. 17
Answer: Option A
Solution (By JKExamLibrary)
The differences are: 2, 3, 4. The next difference is 5. Therefore, 13+5=18.

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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? 5, 10, 20, 40, ?
A. 90
B. 60
C. 70
D. 80

Correct Answer: Option D


Explanation:
Each term is multiplied by 2. Therefore, 40×2=80.

This question belongs to: Reasoning Number Series
Question #2
What will come in place of the question mark (?) in the following number series? 24, 30, 36, 42, ?
A. 48
B. 50
C. 60
D. 54

Correct Answer: Option A


Explanation:
The series increases by 6 each time. Therefore, 42+6=48.

This question belongs to: Reasoning Number Series
Question #3
What will come in place of the question mark (?) in the following number series? 3, 11, 27, 59, 123, ?
A. 251
B. 247
C. 253
D. 249

Correct Answer: Option A


Explanation:
Each term is obtained by multiplying by 2 and adding 5. (3×2)+5=11, (11×2)+5=27, (27×2)+5=59, (59×2)+5=123. The next term is (123×2)+5=251.

This question belongs to: Reasoning Number Series