CA Foundation · Quantitative Aptitude · Number Series, Coding-Decoding and Odd Man Out
Four of the following numbers share a common property, and one does not. Which number is the odd one out among 17, 29, 33 and 41?
The odd one out is 33. The numbers 17, 29 and 41 are all prime, having no factors other than 1 and themselves. But 33 is divisible by 3 and 11, so it is composite. All four are odd, so oddness cannot separate them.
- A17
- B29
- C33Correct
- D41
Explanation
17, 29 and 41 are prime numbers because each has no divisors other than 1 and itself. 33 equals 3 × 11, so it is composite. Hence 33 is the odd one out. Being odd is not the distinguishing property, since all four numbers are odd.
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