Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the one that is different.

11 : 111

The logic followed here is :

(ist number) × (ist number - 2 ) = second number

18 : 288 ⇒ 18  × (18 - 2 ) = 288

11 : 111 ⇒ 11  × (11 - 2 ) = 99 ≠ 111

12 : 120 ⇒ 12  × (12 - 2 ) = 120

13 : 143  ⇒ 13  × (13 - 2 ) = 143