Question : Find out the wrong number in the sequence 169, 144, 121, 100, 82, 64, 49.
Option 1: 144
Option 2: 49
Option 3: 64
Option 4: 82
Correct Answer: 82
Solution : Given: The sequence 169, 144, 121, 100, 82, 64, 49 can be written as 13 2 , 12 2 , 11 2 , 10 2 , 82, 8 2 , 7 2 in the same order. Observe that all the numbers are perfect squares except 82. Hence, the correct answer is 82.
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