Three of the following pairs of numbers are alike in a certain way and one is different. Identify the odd one out. Operations should be performed on the whole numbers, without breaking down the numbers into their digits.

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Let's analyze each pair to find a pattern:

1. Pair (36, 84):
   - 36 × 2 = 72, 36 × 3 = 108, 36 × 2.33 = 84 approximately.
   - Check difference: 84 - 36 = 48
   - Check ratio: 84 / 36 = 7/3 = 2.33

2. Pair (72, 168):
   - 168 / 72 = 7/3 = 2.33
   - Difference: 168 - 72 = 96

3. Pair (66, 154):
   - 154 / 66 ≈ 2.33
   - Difference: 154 - 66 = 88

4. Pair (33, 72):
   - 72 / 33 ≈ 2.18
   - Difference: 72 - 33 = 39

Observation:
- For pairs 1, 2, and 3, the ratio of second number to first number is approximately 7/3 (2.33).
- For pair 4, the ratio is approximately 2.18, which is different.

Hence, the odd one out is pair 4: 33 – 72.

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