Explanation:

Let’s break it down step by step:

- Here’s the sequence: 26, 29, 33, 39, 50, 61.

- Let’s look at the differences:

- 29 - 26 = 3

- 33 - 29 = 4

- 39 - 33 = 6

- 50 - 39 = 11

- 61 - 50 = 11

- At first, the numbers go up by 3, then 4, then 6—so each jump is getting bigger, but then suddenly it leaps by 11 (from 39 to 50), and again by 11 (from 50 to 61). That looks fishy.

- If the series is meant to increase progressively, after 6, maybe they meant to add 8 next? 39 + 8 = 47, not 50.

Now, a quick check if 47 fits:

- 39 ? 47 is +8

- 47 ? 58 is +11 (matches pattern, then 58 ? ???)

- Actually, in the given list, only 50 (not 47) is present, breaking the pattern.

What this really means is: 50 is the number that doesn’t fit.

- Option 4, 50, is the odd one.

- The correct sequence would be 26, 29, 33, 39, 47, 58 (to keep the difference pattern: 3, 4, 6, 8, 11).

Correct answer:

- Option 4, 50.