In the following question, four number pairs are given. In each pair the number on the left side of ( - ) is related to the number of the right side of ( - ) with some Logic/Rule/Relation. Three pairs are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 21 - Operation on 21 such as adding/subtraction/division etc. to 21 can be performed. Breaking down 21 into 2 and 1 and then performing mathematical operations on 2 and 1 is not allowed)