Mirrored from philosophy.hku.hk/think/
Critical Thinking Web

Answer to exercise #1b

Step 1

P
Q
R
(
(
P
&
Q
)
→
R
)
T T T
T
T
T
T T F
T
T
F
T F T
T
F
T
T F F
T
F
F
F T T
F
T
T
F T F
F
T
F
F F T
F
F
T
F F F
F
F
F

Step 2

P
Q
R
(
(
P
&
Q
)
 →
R
)
T T T
T
T
T
T
T T F
T
T
T
F
T F T
T
F
F
T
T F F
T
F
F
F
F T T
F
F
T
T
F T F
F
F
T
F
F F T
F
F
F
T
F F F
F
F
F
F

Step 3

P
Q
R
(
(
P
&
Q
)
 →
R
)
T T T
T
T
T
T
T
T T F
T
T
T
F
F
T F T
T
F
F
T
T
T F F
T
F
F
T
F
F T T
F
F
T
T
T
F T F
F
F
T
T
F
F
F
 T
F
F
F
T
T
F F F
F
F
F
T
F