In the following question, four groups of numbers are given. The numbers in each group are related by a certain logic. Select the group in which the numbers do not follow that logic. (Note: Operations should be performed on whole numbers, without breaking down the numbers into constituent digits).

Four letter-pairs are given below. The letters on the left side of (-) are related to the letters on the right side following a specific logic/rule. Three of them share the same rule. Select the odd one out.

Four letter-pairs are given. The letters on the left side of (-) are related to the letters on the right side of (-) by some logic. Three of them follow the same logic. Select the odd one out.