Three of the following four options are alike in a certain way and thus form a group. Which is the one that does NOT belong to that group? (Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits.)

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Let's analyze each option by performing the operations as written (left to right):

1. 540 – 188 – 128 = (540 – 188) – 128 = 352 – 128 = 224
2. 72 – 284 – 266 = (72 – 284) – 266 = (–212) – 266 = –478
3. 81 – 101 – 92 = (81 – 101) – 92 = (–20) – 92 = –112
4. 90 – 22 – 12 = (90 – 22) – 12 = 68 – 12 = 56

Now, let's look for a pattern:
- Options 1, 3, and 4: The result is an even number (224, –112, 56), and all are multiples of 56 (224 = 56×4, –112 = 56×–2, 56 = 56×1).
- Option 2: The result is –478, which is not a multiple of 56.

Therefore, option 2 (72 – 284 – 266) does NOT belong to the group.

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