Congratulations, you've finally exposed yourself. The original problem tou link to is based on real intervals derives its 50% result from the fact that any two real intervals, even one unbounded versus one bounded, have the same cardinality. It's source is first year maths where students are introduced to such concepts before getting into the finer points of real number analysis. Your new version (accidental?) with natural numbers doesn't work the same way. It is not insulting to expose your mistakes, the only damage is what you do to yourself by pretending with substantial futility and tell-tale superwaffle to understand more than you actually do.