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 1 and 3 is not allowed.)
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 27-53.
18 - 37 → 18 × 2 + 1 = 37
33 - 67 → 33 × 2 + 1 = 67
29 - 59 → 29 × 2 + 1 = 59
27 - 53 → 27 × 2 + 1 = 55 ≠ 53