In the following question, four options are given. Out of these, three are alike in a particular way, but the remaining one is different. Find the odd one out.
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 26:572
In each pair the second number is built from the first: it is the first number multiplied by the number two less than itself, that is \(n\times(n-2)\).
Option (1) 13:143 — \(13\times11=143\), follows the rule.
Option (2) 18:288 — \(18\times16=288\), follows the rule.
Option (3) 23:483 — \(23\times21=483\), follows the rule.
Option (4) 26:572 — \(26\times24=624\), but the pair gives 572, which is \(26\times22\); so 26:572 is the odd one out.