Three of the following four options are alike in a certain way and thus form a group. Which is the option 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 /deleting /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: C
Explanation
The correct answer is option 3 i.e. 3 – 2 – 5.
Logic: Multiplication of the first two digits = Third digit
Option 1: 2 – 4 – 8 = (2 × 4) = 8
Option 2: 2 – 2 – 4 = (2 × 2) = 4
Option 3: 3 – 2 – 5 = (3 × 2) = 6 ≠ 5
Option 4: 1 – 3 – 3 = (1 × 3) = 3
Hence, 3 – 2 – 5 is the odd group.