1. ContemporaryPhilosophy
Class Activity
Find out whether the following arguments are valid or invalid and sound or unsound:
1.All trees are plants. (T)
All oaks are trees.(T)
Therefore all oaks are plants.(T)
Ans: Valid and sound.
2.All tress are plants.(T)
All oaks are plants.(F)
So all oaksare trees. (T)
Ans: Invalid and unsound.
3.All trees are plants. (T)
All roses are plants. (T)
Therefore, all roses are trees.(F)
Ans: Invalid and unsound.
4.All tress are flowers.(F)
All roses are tress.(F)
So, all roses are flowers.(T)
Ans: Valid and unsound.
5.All trees are shrubs.(F)
All oaks are shrubs.(F)
Therefore, all oaks are tress.(T)
Ans: Invalid and unsound.
6.All trees are shrubs.(F)
All roses are trees.(F)
Therefore, all roses are shrubs.(F)
Ans: valid and unsound.
7.All trees are shrubs. (F)
All roses are shrubs.(F)
So, all roses are tress.(F)
Ans: Invalid and unsound.
