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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