Correct Answer: 8 – 36

Solution : On determining the square and cube, we will get:

First option: 8 – 36
'8' is not the square of any number. '36' is also not the cube of any number. Hence '8 – 36' is the odd one out.

Second option: 16 – 64
Square of 4 = 16 ; Cube of 4 = 64

Third option: 36 – 216
Square of 6 = 36 ; Cube of 6 = 216

Fourth option: 25 – 125
Square of 5 = 25 ; Cube of 5 = 125

Hence, first option is correct.