Question
Find the odd number out in the following set and state the reason: 131, 151, 171, 191, 211
Solution
Check primality: 131 is prime 151 is prime 171 = 3 × 57 = 3 × 3 × 19 (not prime) 191 is prime 211 is prime All except 171 are prime numbers. Answer: 171 is the odd one out (it is not prime).
More Wrong Series Questions
- 92, 88, 79, 63, 40
- Find the wrong number in the given number series. 548, 532, 568, 510, 604, 460
- The following numbers form a series. Find the odd one out. 210, 211, 219, 245, 310, 435
- 33 34 37 42 48 58
- 86,142, 232, 364, 547
- Find the wrong number in the given number series. 5, 8, 18, 24, 37, 48
- 45, 166, 310, 480, 675, 900
- 7, 16, 33, 74, 153, 312
- 14Â Â Â Â 15Â Â Â Â Â 24Â Â Â Â Â Â 50Â Â Â Â Â Â 98Â Â Â Â Â 179
- 0Â Â Â Â Â Â Â Â Â Â Â Â Â 7Â Â Â Â Â Â Â Â Â Â Â Â Â 26Â Â Â Â Â Â Â Â Â Â 63Â Â Â Â Â Â Â Â Â Â 126Â Â Â Â Â Â Â Â 215
Relevant for Exams:
