Discussion
Find the one which does not belong to that group ?
Answer: D
Three of the four numbers are prime.
\[ 41,\; 43,\; 53 \;\text{are prime} \]
\[ 57 = 3 \times 19 \]
So 57 does not belong. Its digit sum is 12, a multiple of 3 - 57 is a classic "looks prime but isn't" number.
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