laxpro2001 wrote:

For everyone picking numbers that let any expression get large, don't forget that 0 is a multiple of all 3 and 4 as well.

Instead of having to compute 3^5 - 6 to prove statement 1 to be insufficient, you can just compute 3^0 - 0 which gives you 1 which is not divisible by 6.

Hi

The method of substituting 0 is cool, and I can see that how it can help in many questions, by making them easy.

However, here in this question, we Cannot substitute x=0 as its given both x and y are positive integers.