What will come in place of the question mark (?) in the following number series? 10, 24, 42, 64, 90, ? MCQ with Answer and Explanation

What will come in place of the question mark (?) in the following number series? 10, 24, 42, 64, 90, ?
A. 120
B. 110
C. 116
D. 112
Answer: Option A
Solution (By JKSSB Mock Tests)
The differences are: 14, 18, 22, 26. These are increasing by 4. The next difference is 30. Therefore, 90+30=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? 11, 22, 55, 165, ?
A. 577.5
B. 333.5
C. 495.5
D. 325.5

Correct Answer: Option A


Explanation:
The pattern is: 11×2=22, 22×2.5=55, 55×3=165. The multiplier increases by 0.5 each time. The next multiplier is 3.5. Therefore, 165×3.5=577.5.[reference:11]

This question belongs to: Reasoning Number Series
Question #2
What will come in place of the question mark (?) in the following number series? 20, 18, 15, 11, ?
A. 8
B. 7
C. 6
D. 5

Correct Answer: Option C


Explanation:
The differences are: -2, -3, -4. The next difference is -5. Therefore, 11-5=6.

This question belongs to: Reasoning Number Series
Question #3
What will come in place of the question mark (?) in the following number series? 2, 3, 5, 7, ?
A. 10
B. 11
C. 9
D. 8

Correct Answer: Option B


Explanation:
The given series consists of consecutive prime numbers. The prime numbers in order are 2, 3, 5, 7, 11, 13... Therefore, the next prime number after 7 is 11.[reference:0]

This question belongs to: Reasoning Number Series