When a conclusion is assumed to be true, only when there is a possibility. Something that is possible, is possible, it not true with 100% certainty. This is called the 'appeal to possibility.'
The Logical form:
X is possible.
Therefore, X is true.*
1. The Low GPA
Brittany: I haven’t applied to any other schools besides Harvard.
Casey: You think that is a good idea? After all, you only have a 2.0 GPA, your SAT scores were pretty bad, and frankly, most people think you are not playing with a full deck.
Brittany: Are you telling me that it is impossible for me to get in?
Casey: Not *impossible*, but...
Brittany: Then shut your trap.*
2. Some Simple Examples
Something can go wrong (premise).
Therefore, something will go wrong (invalid conclusion).
If I do not bring my umbrella (premise)
It will rain. (invalid conclusion).**
*Logically Fallacious: The Ultimate Collection of Over 300 Logical Fallacies by Bo Bennett, PhD
Categorisation: philosophy → logic → logical fallacies → formal
* * *