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The second number in the given number pairs is obtained by performing certain mathematical operation(s) on the first number.
The same operation(s) are followed in all the number pairs, EXCEPT one. Find that odd number pair.
21 : 431
15 : 225
13 : 169
12 : 144
- The task is to find an inconsistency in number pairs based on a mathematical operation.
- Option 1: 21 : 431
- If we square 21, we get 441. This is not equal to 431.
- Operation doesn't match.
- Option 2: 15 : 225
- Squaring 15 gives 225. This matches.
- Operation is consistent.
- Option 3: 13 : 169
- 13 squared equals 169. This matches.
- Option 4: 12 : 144
- Squaring 12 results in 144. This matches.
- Option 1: 21 : 431 is the odd one out as it doesn’t follow the squaring rule.
Answer: Option 1 (21 : 431)
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