The same operation(s) are followed in all the given number pairs except one. Find that odd number pair. (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 pair to find a consistent operation applied to the first number to get the second number:

1. Pair (24 : 4):
   - Check division: 24 / 4 = 6 (not equal to 4)
   - Check subtraction: 24 - 4 = 20 (not equal to 4)
   - Check if second number is a factor of first: 4 is a factor of 24 (24/4=6)
   - Check if second number is a divisor or related by multiplication: 4 * 6 = 24
   No simple consistent operation like division by a fixed number or subtraction leads to 4.

2. Pair (36 : 24):
   - 36 - 12 = 24
   - 36 * 2/3 = 24
   So, multiplying 36 by 2/3 gives 24.

3. Pair (12 : 8):
   - 12 * 2/3 = 8
   So, multiplying 12 by 2/3 gives 8.

4. Pair (72 : 48):
   - 72 * 2/3 = 48
   So, multiplying 72 by 2/3 gives 48.

From pairs 2, 3, and 4, the operation is multiplying the first number by 2/3 to get the second number.
Pair 1 does not follow this operation (24 * 2/3 = 16, not 4).

Therefore, the odd pair is (24 : 4).

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