To solve this question, we need to identify the pattern or rule that applies to most of the images and find which one doesn't follow it.

Let's analyze each image according to the letters and numbers provided.

1. For image (1): The letters are Q and U. Their positions in the alphabet are 17 and 21, respectively. The sum is 17 + 21 = 38. However, 40 is given.
2. For image (2): The letters are M and W. Their positions in the alphabet are 13 and 23, respectively. The sum is 13 + 23 = 36. However, 38 is given.
3. For image (3): The letters are E and K. Their positions in the alphabet are 5 and 11, respectively. The sum is 5 + 11 = 16. This matches the number given.
4. For image (4): The letters are G and S. Their positions in the alphabet are 7 and 19, respectively. The sum is 7 + 19 = 26. However, 28 is given.

From the analysis, the patterns in images (1), (2), and (4) have a number that is 2 more than the sum of the alphabet positions of the given letters.

Image (3) is the odd one out because it correctly matches the exact sum of alphabet positions.

Thus, option 3 is the correct answer.