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 1
The logic is :
(Ist number × 7) - 8 = second number
15 : 197 = (15 × 7) - 8 = 97 but 197 is given (ODD)
25 : 167 = (25 × 7) - 8 = 167
27 : 181 = (27 × 7) - 8 = 181
21 : 139 = (21 × 7) - 8 = 139