Three of the numbers are alike in a certain way and one is different. Select the number that is different.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 119
Splitting each number into prime factors shows what three of them have in common:
Option (1) 133 — \(7\times19\)
Option (2) 209 — \(11\times19\)
Option (3) 119 — \(7\times17\); it is the only one that is not a multiple of 19, so 119 is the odd one out
Option (4) 247 — \(13\times19\)