Introduction to Logic
Tools
for
Thought
Exercise 1.7 - Logical Reasoning
Say whether or not each of the following rules is logically correct.
a.
All x are z.
All y are z.
Therefore, some x are y.
correct
incorrect
b.
Some x are y.
All y are z.
Therefore, some x are z.
correct
incorrect
c.
All x are y.
Some y are z.
Therefore, some x are z.
correct
incorrect