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.
Answer & explanation
Correct answer: option 3
THE LOGIC;
( (1st number x4) - 8 = 2nd number )
1) 19 : 68,
(19 x4) -8 = 68
2) 23 : 84,
(23 x4) -8 = 84
3) 13 : 90,
(13 x4) -8 = 44
4) 17 : 60,
(17 x4) -8 = 60
Thus, 13 : 90 is correct option.