Three of the following four options 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 1 and 3 is not allowed.)
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 72 – 284 – 266.
Logic: 2nd number - (1st number ÷ 9) = 3rd number
540 – 188 – 128 → 188 - (540 ÷ 9) = 188 - 60 = 128
72 – 284 – 266 → 284 - (72 ÷ 9) = 284 - 8 = 276 (Not 266)
81– 101– 92 → 101 - (81 ÷ 9) = 101 - 9 = 92
90 – 22– 12 → 22 - (90 ÷ 9) = 22 - 10 = 12