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. 182 : 12.
| Understanding |
|---|
|
The logic used here is: (2nd number)2 + 3 × 2nd number + 1 = 1st number Option 1: 182 : 12 122 + 3 × 12 + 1 = 144 + 36 + 1 = 181 Option 2: 461 : 20 202 + 3 × 20 + 1 = 400 + 60 + 1 = 461 Option 3: 239 : 14 142 + 3 × 14 + 1 = 196 + 42 + 1 = 239 Option 4: 305 : 16 162 + 3 × 16 + 1 = 256 + 48 + 1 = 305 Hence, 182 : 12 is the correct answer. |