Three of the following numbers are alike in a certain way and one is different. Pick the odd one out.
(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their 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: B
Explanation
The correct answer is option 2 i.e. 27 – 9 – 243.
Logic: (1st number × 2nd number) + 5 = 3rd number
Option 1) 31 – 5 – 160 → (31 × 5) + 5 = 155 + 5 = 160
Option 2) 27 – 9 – 243 → (27 × 9) + 5 = 243 + 5 = 248 (not 243)
Option 3) 21 – 4 – 89 → (21 × 4) + 5 = 84 + 5 = 89
Option 4) 13 – 8 – 109 → (13 × 8) + 5 = 104 + 5 = 109