Mathematics · Classification

Four triads of numbers have been given out of which three are alike in some manner and one is different. Select the one that is different. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 - Operations on 13 such as adding/deleting/multiplying etc. to 13 can be perform ed. Breaking down 13 into 1 and 3 and then performing mathematical operation s on 1 and 3 is not allowed.)