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.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 15: 197
Logic :
1st number x 7 - 8 = 2nd number
We can apply this logic to all numbers and see the result.
1. 15 x 7 - 8 = 105 - 8 = 97
2. 25 x 7 - 8 = 175 - 8 = 167
3. 27 x 7 - 8 = 189 - 8 = 181
4. 21 x 7 - 8 = 147 - 8 = 139
All three are the same except for 1st option.
Hence, the correct answer is 15: 197.