In the following question, four number pairs are given. In each pair the number on the left side of (-) is related to the number on 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.13 - Operations on 13 such as adding /subtracting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)

13 - 163

The logic followed here Is :

(Ist number )² - 4  =  second number)

13 - 163 = 13² - 4 = 165 ≠ 163

9 - 77 = 9² - 4 = 77

18 - 320  = 18² - 4 = 320

24 - 572 = 24² - 4 = 572