Question : Directions: In the following question, select the one which is different from the other three alternatives.
Option 1: 21
Option 2: 81
Option 3: 51
Option 4: 71
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Correct Answer: 71
Solution : Let's check the options – First option: 21; 21 ÷ 3 = 7; 21 is divisible by 3. Second option: 81; 81 ÷ 3 = 27; 81 is divisible by 3. Third option: 51; 51 ÷ 3 = 17; 51 is divisible by 3. Fourth option: 71; 71 is not divisible by 3.
So, the fourth option is different from the other three options as 71 is not divisible by 3. Hence, the fourth option is correct.
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