Using a diagram as a test

Exercise and reference answers

Questions

1. Question

   A conclusion is valid when

   Choices

   1. one diagram supports it
   2. the premises are true
   3. every consistent diagram supports it

   Correct choice

   every consistent diagram supports it

2. Question

   Finding one consistent diagram where it fails means

   Choices

   1. the argument is invalid
   2. the argument is valid
   3. nothing at all

   Correct choice

   the argument is invalid

3. Question

   'All A is B' drawn as circles gives

   Choices

   1. B inside A
   2. A inside B
   3. two separate circles

   Correct choice

   A inside B

Explanation