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. (Any operation on digits is not allowed)
Answer & explanation
Correct answer: option 4
THE LOGIC;
(the 2nd number x 3 + 5 = 1st number)
So,
1) 326 : 107
326 : 107 → 3 x 107 + 5 = 321 + 5 = 326
2) 239 : 78
239 : 78 → 3 x 78 + 5 = 234 + 5 = 239
3) 308 : 101
308 : 101 → 3 x 101 + 5 = 303 + 5 = 308
4) 197 : 66
197 : 66 → 3 x 66 + 5 = 198 + 5 = 203 is not equal to 197.
Thus, 197 : 66 is correct.