Which number is incorrect in the sequence 1, 9, 27, 49, 81, 121?

Correct answer: 27. The sequence is squares of odd numbers: 1, 9, 25, 49, 81, 121, so 27 should be 25.

• 49 is not the correct answer to this question.
• 81 is not the correct answer to this question.
• 121 is not the correct answer to this question.