Some arguments are stronger than others because they are easier to prove or harder to prove and the evidence supports them. Also, they do not have unstated assumptions, and all of the supports are clearly laid out to follow one after the other. The Disney Vacation club is the strongest because we know all of the necessary things to access the fast pass membership, and we know that if Walt did not do one of them but is still a member, then he must have done the other. Also, the tiger argument is the second strongest because it may rely on one unstated assumption: animals that are aggressive and can cause serious injuries are not suitable pets. The final argument is the least strong because there are no qualifier words to tell us the strength of the premises, and we do not know if he did it intentionally, or whether he did it at all.

Citizens of Socrates' ideal city can be philosophers. Those who have completed musical and physical training can be immediately accepted as philosophers. All other citizens must wait to do public service. Glaucon is a philosopher, but he hasn't done any musical/physical training. Therefore, Glaucon must have done public service.