Three of the following numbers are alike in a certain way and one is different. Pick the odd one out.
(NOTE : Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 – Operations on 13 such as adding /deleting /multiplying etc., to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

Logic: For the given number pairs, divide the first number by 3 and the second number by 7 to get the same number as the resultant.

(a) 36 - 84 → 36 $$\div$$ 3 = 12; 84 $$\div$$ 7 = 12​

(b) 72 - 168 → 72 $$\div$$ 3 = 24; 168 $$\div$$ 7 = 24

(c) 66 - 154 → 66 $$\div$$ 3 = 22; 154 $$\div$$ 7 = 22

(d) 33 - 72 → 33 $$\div$$​ 3 = 11; 72 $$\div$$​ 7 = 10.29 (72 is not completely divisible by 7.)

From the analysis, we can see that options (a), (b), and (c) follow the same pattern. But, in option (d), the second number is not divisible by 7.

Therefore, the odd one out of the given options is (33 - 72).

Thus, the correct option is (d).