Find the missing term: 3, 6, 9, 12, 15, ? MCQ with Answer and Explanation

Find the missing term: 3, 6, 9, 12, 15, ?
A. 20
B. 18
C. 21
D. 16
Answer: Option B
Solution (By JKSSB Mock Tests)
The terms increase by 3 each time: 15+3=18.

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Practice More Mental Reasoning Questions

Question #1
A man walks 5 km toward south and then turns to the right. After walking 3 km he turns to the left and walks 5 km. Now in which direction is he from the starting place?
A. West
B. North-East
C. South-West
D. South

Correct Answer: Option C


Explanation:
Start facing South 5 km, turn right (West) 3 km, turn left (South) 5 km. Final position is 10 km South and 3 km West of start, i.e., South-West.

This question belongs to: Reasoning Mental Reasoning
Question #2
If the first and second letters in the word 'COMMUNICATIONS' are interchanged, also the third and fourth letters, the fifth and sixth letters and so on, which letter would be the 10th letter counting from your right?
A. N
B. T
C. A
D. U

Correct Answer: Option D


Explanation:
Word: C O M M U N I C A T I O N S. Interchange pairs: O C M M N U C I T A O I S N. From right: N S I O A T I C U N M M C O. 10th from right is U.

This question belongs to: Reasoning Mental Reasoning
Question #3
If 3 is coded as 6, 4 as 12, 5 as 20, then 6 is coded as?
A. 42
B. 30
C. 36
D. 24

Correct Answer: Option B


Explanation:
The pattern is n×(n-1): 3×2=6, 4×3=12, 5×4=20, so 6×5=30.

This question belongs to: Reasoning Mental Reasoning