The wrong number of the sequence 36, 81, 144, 225, 256,

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The wrong number of the sequence 36, 81, 144, 225, 256, 441 is

1. 36
2. 81
3. 225
4. 256

Correct Option: D

The pattern of the sequence is :
6² = 36
9² = 81
12² = 144
15² = 225
18² = 324 ≠ 256
21² = 441
From above , It is clear that the wrong number of the sequence is 256 .