Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different from the rest.

11 : 121 13 : 169 17 : 289 15 : 250

15 : 250

THE LOGIC; (1st Number x 1st Number = 2nd number)  1) 11 : 121, 11 x 11 = 121 2) 13 : 169, 13 x 13 = 169 3) 17 : 289, 17 x 17 = 289 4) 15 : 250, 15 x 15 = 225 Thus, 15 : 250 is the odd one.