Find the ODD one out from the given options.
(Note: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 - operation on 13 such as adding/subtracting/multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
Show answer & explanation
Correct answer: A
Explanation
Answer: 289
Solution (using divisibility check on whole numbers):
Test each number for divisibility by 3:
- 324 ÷ 3 = 108 ✓ (divisible)
- 234 ÷ 3 = 78 ✓ (divisible)
- 255 ÷ 3 = 85 ✓ (divisible)
- 289 ÷ 3 = 96.33... ✗ (NOT divisible)
289 is the odd one out — it's the only number not divisible by 3.