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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