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: A
Explanation
The correct answer is option 1 i.e. 68 – 54 – 94.
Logic: (Difference between 1st and 3rd number) × 2
Except 68 – 54 – 94 all follow the same pattern.
68 – 54 – 94 ⇒ (68 - 94) × 2 = 52 ≠ 54