Question : Direction: In the following question, select the one which is different from the other three alternatives.
Option 1: 41 - 72
Option 2: 12 - 30
Option 3: 51 - 42
Option 4: 11 - 20
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Correct Answer: 41 - 72
Solution : Let's check the options —
First option: 41 - 72; 4 + 1 = 5; 7 + 2 = 9. The sum of the digits of the two numbers is not equal. This option is different from the other options.
Second option: 12 - 30; 1 + 2 = 3; 3 + 0 = 3. The sum of the digits of the two numbers is equal.
Third option: 51 - 42; 5 + 1 = 6; 4 + 2 = 6. The sum of the digits of the two numbers is equal.
Fourth option: 11 - 20; 1 + 1 = 2; 2 + 0 = 2. The sum of the digits of the two numbers is equal.
Hence, the first option is correct.
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