Spot the false rule in each set

Exercise and reference answers

Questions

1. False statement

   Two negative premises can still yield a conclusion.

   Statements

   1. A syllogism has three propositions and three terms.
   2. The middle term must be distributed at least once.
   3. Two negative premises can still yield a conclusion.

2. False statement

   Two particular premises can yield a conclusion.

   Statements

   1. Two particular premises can yield a conclusion.
   2. If one premise is negative, the conclusion is negative.
   3. If one premise is particular, so is the conclusion.

3. False statement

   The middle term reappears in the conclusion.

   Statements

   1. The minor term is the subject of the conclusion.
   2. The middle term reappears in the conclusion.
   3. The major term is the predicate of the conclusion.

4. False statement

   Figure III can prove a universal conclusion.

   Statements

   1. A negative conclusion needs a negative premise.
   2. Figure is fixed by where the middle term stands.
   3. Figure III can prove a universal conclusion.

Instructions

Two rules in each set hold. Tap the one that is false.

Explanation