Question : Directions: In the following question, find the odd number from the given alternatives.
Option 1: 25
Option 2: 49
Option 3: 81
Option 4: 121
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Correct Answer: 81
Solution : Let's check the option – First option: 25; 25 = 5 2 → 5 is a prime number. Second option : 49; 49 = 7 2 → 7 is a prime number. Third option : 81; 81 = 9 2 →9 is not a prime number. Fourth option :121; 121 = 11 2 →11 is a prime number.
So, the third option is different from the other options as 9 is not a prime number. Hence, the third option is correct .
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