GMAT assumption questions
The question asks what the argument takes for granted. It is the purest form of the gap, and there is a mechanical test that settles nearly all of them: negation.
The negation test
Take an option and negate it. If the argument collapses, that option was a necessary assumption. If the argument survives, it was not.
- Identify the conclusion and the evidence.
- Take each option and state its opposite.
- Ask whether the conclusion still stands.
- The one that destroys the argument when negated is the answer.
This converts a judgement call into a check, which is why it is worth the few seconds it takes on a close pair.
What an assumption is not
- Not extra support. An option that would strengthen the argument is not necessarily assumed by it.
- Not a restatement of the evidence or the conclusion.
- Not too strong. Necessary assumptions are usually modest — "at least some", "not entirely" — because the argument needs little.
- Not outside the scope. If it introduces a new subject the argument never touched, it is not what the argument assumed.
The most common wrong answer is a statement that would help the argument a great deal. Helping is sufficiency; the question asks about necessity.
Assumption questions — FAQs
2 questions
Negate an option; if the argument falls apart, that option is a necessary assumption.
No, usually weak ones. An argument needs the minimum, and strong options tend to be wrong.
More verbal question types
Sources
Written from the test board's own published material and checked on 1 October 2026.