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 : 122 14 : 112 21 : 168 18 : 144

11 : 122

The logic followed here is: Ist number × 8  = second number 11 : 122 ⇒ 11 × 8 = 88 ≠ 122 14 : 112 ⇒ 14 × 8 = 112 21 : 168 ⇒ 21 × 8 = 168 18 : 144 ⇒ 18 × 8 = 144