Syllogisms — true or false?

Exercise and reference answers

Questions

1. Statement is true

   Yes

   Statement

   If all A are B and all B are C, then all A are C.

2. Statement is true

   No

   Statement

   If some A are B and some B are C, then some A are C.

3. Statement is true

   Yes

   Statement

   If no A are B, then no B are A.

4. Statement is true

   No

   Statement

   If all P are Q, then no non-P is Q.