Activity One
Recognising Premise and Conclusion

Using the rules specified above, identify which of the following hypothetical arguments is valid and which commits a formal fallacy and is therefore invalid.


1. If this lunch is not yours, then I will eat it.
I will not eat it.
Therefore, it must be yours.

2. If climate change is caused by humans, then it is not caused by natural cycles.
It is not caused by natural cycles.
Therefore, it is caused by humans.

3. If the government increases interest rates, the property market will slump.
The government has not increased interest rates.
Therefore, the property market will not slump.