Explanation:

- Let's examine the number series: 54, 58, 49, 65, 42, 76.

- Consider the changes between numbers:

- 54 to 58, a difference of +4.

- 58 to 49, a difference of -9.

- 49 to 65, a difference of +16.

- 65 to 42, a difference of -23.

- 42 to 76, a difference of +34.

- This series alternates between adding a square number and subtracting sequential odd numbers: 2² (+4), 3² (-9), 4² (+16), and 5² (-25), so the pattern should continue with subtracting 7² (-49).

- The problematic number is "42," as the actual subtraction should have been -25 (65 - 25 = 40) rather than -23 (65 - 23 = 42).

- Therefore, correcting the series pattern, "42" should be "40."

- Correct Answer: Option 3 (42)