Find the odd one out: 13, 17, 19, 21 MCQ with Answer and Explanation

Find the odd one out: 13, 17, 19, 21
A. 21
B. 19
C. 13
D. 17
Answer: Option A
Solution (By JKSSB Mock Tests)
21 is composite, while 13, 17 and 19 are prime numbers.

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Practice More Mental Reasoning Questions

Question #1
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. A
B. U
C. T
D. N

Correct Answer: Option B


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 #2
Statements: Some fruits are apples. All apples are mangoes. Conclusions: I. Some mangoes are fruits. II. Some fruits are mangoes. Which conclusion(s) follow(s)?
A. Only II follows
B. Only I follows
C. Both I and II follow
D. Neither I nor II follows

Correct Answer: Option C


Explanation:
Some fruits are apples + All apples are mangoes gives 'Some fruits are mangoes'. Converse gives 'Some mangoes are fruits'. Thus both follow.

This question belongs to: Reasoning Mental Reasoning
Question #3
Find the missing term: 2, 4, 12, 48, ?
A. 120
B. 144
C. 240
D. 192

Correct Answer: Option C


Explanation:
Multipliers are 2, 3, 4, 5: 2×2=4, 4×3=12, 12×4=48, so 48×5=240.

This question belongs to: Reasoning Mental Reasoning