Sample Questions: Sufficient Assumption
Find the premise that would make the conclusion follow for sure. Three original questions below. No timer. Check each answer and read the explanation before moving on.
The festival will sell out. Last year's festival sold out, and this year's lineup is even stronger.
Which of the following, if assumed, guarantees the conclusion?
B is a universal rule that applies directly to this case, making the sellout a matter of logic. The others only make it likely.
The defendant must have been at the scene. His car was found in the parking lot, and he never lends his car to anyone.
The conclusion follows logically if which of the following is assumed?
B connects the car's location to the defendant's location with no gaps. That is all the argument needs to become airtight.
This bill will pass. Every bill with bipartisan support has passed this session, and this bill has bipartisan support.
The argument is already valid, but which restatement captures the principle that makes it so?
This is pure universal instantiation: all X are Y, this is X, so this is Y. B states that logical rule.
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Last updated October 12, 2026