Three of the following four are alike in a certain way and thus form a group. Which is the one that does NOT belong to that group? (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 / subtracting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1and 3 is not allowed)

Correct option is C

Logic: 1st ÷ 2 = 2nd
From the given options-
(a) 364-182 → 364 ÷ 2 = 182
(b) 438-219 → 438 ÷ 2 = 219
(c) 524-260 → 524 ÷ 2 = 262 ≠ 260
(d) 986-493 → 986 ÷ 2 = 493
Thus, the correct answer is (c) 524-260.