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 the operation between the pairs:

1. 56 : 9
2. 44 : 7
3. 68 : 11
4. 72 : 12

Let's try to find a pattern. Since we are not allowed to break the numbers into digits, let's check if the second number is related to the first by division, subtraction, or any other operation.

Check if the second number is the result of dividing the first number by something:

56 / 9 ≈ 6.22
44 / 7 ≈ 6.29
68 / 11 ≈ 6.18
72 / 12 = 6

All are close to 6, but let's check if the operation is 'subtract 47' (just as a check):

56 - 47 = 9
44 - 37 = 7
68 - 57 = 11
72 - 60 = 12

No clear pattern. Let's try dividing the first number by the second:

56 / 9 ≈ 6.22
44 / 7 ≈ 6.29
68 / 11 ≈ 6.18
72 / 12 = 6

Again, all are close to 6, but 72/12 is exactly 6, while the others are not integers.

Alternatively, check if the second number is a factor of the first:

56 % 9 = 2 (not a factor)
44 % 7 = 2 (not a factor)
68 % 11 = 2 (not a factor)
72 % 12 = 0 (12 is a factor of 72)

So, in the first three pairs, the second number is NOT a factor of the first, but in the fourth pair (72 : 12), 12 is a factor of 72.

Therefore, the odd pair is 72 : 12.

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