Sufficient assumptions vs. Necessary assumptions

@Cammy, The two question types you're referring to are strengthen with a necessary premise and strengthen with a sufficient premise. Let's take a look at how they differ. 1) strengthen with a necessary premise questions These questions typically say things like Which one of the following is an assumption on which the argument depends? Which one of the following is an assumption required by the editorial's argument? The consumer's argument relies on the assumption that Which one of the following is an assumption on which the argument depends? Which one of the following is an assumption required by the researcher's argument? The key giveaway in these question stems that tell us they're strengthen with necessary premise questions is that they all contain wording that tells us that we're looking for an assumption that the argument NEEDS/REQUIRES/HAS TO HAVE in order for it to have any chance at holding up. Necessary premises are premises that must be true in order for the argument to hold. In other words, if a necessary premise is false, then the argument falls apart. 2) strengthen with a sufficient premise questions These question types typically say things like Which one of the following, if assumed, enables the psychologist's conclusion to be properly drawn? The ethicist's conclusion follows logically if which one of the following is assumed? The argument's conclusion follows logically if which one of the following is assumed? Which one of the following, if assumed, enables the essayist's conclusion to be properly drawn? The conclusion of the criminologist's argument is properly inferred if which one of the following is assumed? The key giveaway in these question stems that tell us they're strengthen with a sufficient premise questions is that they all contain language that tells us that we're looking for an assumption that, if true, ENABLES THE CONCLUSION TO BE DRAWN/JUSTIFIES THE ARGUMENT, etc. In other words, we're looking for an assumption that, if true, makes the argument valid. Sufficient premises are premises that, if we add them to the argument, automatically make the argument valid. To recap, think of necessary premises as premises that, if false, make the argument lose. Think of sufficient premises as premises that, if true, make the argument win (valid). Does this help? Let us know if you have any other questions!