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 B

Logic: 1st × 9 = 2nd
From the given options-
(a) 14-126 → 14 × 9 = 126
(b) 31-280 → 31 × 9 = 279 ≠ 280
(c) 25-225 → 25 × 9 = 225
(d) 12-108 → 12 × 9 = 108
Thus, the correct answer is (b) 31-280.