Select the odd group of numbers. (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: C
Explanation
The correct answer is Option 3 i.e. 5 – 31.
The logic used here is: (1st number)2 - 10 = 2nd number
Option 1: 13 – 159: 132 - 10 = 169 - 10 = 159, This follows the logic.
Option 3: 5 – 31: 52 - 10 = 25 - 10 = 15, This does not follow the logic.