Discussion
Find the odd one out in the set: {19, 37, 21, 17, 23, 29, 31, 11}
Answer: A
The odd one out is 21.
19, 37, 17, 23, 29, 31 and 11 are all prime numbers, divisible only by 1 and themselves. 21 is the only composite number in the set, since \(21 = 3 \times 7\).
29, 37 and 23 are prime like the rest, so choosing any of them leaves 21 still standing out. There is no other pattern (such as odd or even, or digit sums) that separates one of those primes from the others as cleanly.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development