Question

Question #ef673

Answer 1

The answer is C). 18.

Explanation:

If x and y are two perfect cube numbers, they can be written as
`x`=`m^3` and `y`=`n^3` for some integer (`m,n`).

This means `xy`=`m^3n^3`=`(mn)^3` is also a perfect cube number. So `a`,`b`,`c` and `a+b+c` must be a multiple of 3.