What fallacy is it ? hasty generalization or begging the question ? Is it really a fallacious argumnet or a valid one ?
Premise1- If A is true, then B is true.
Premise 2- A is true.
Conclusion- B is true.
We have no empirical evidence for supporting P1 and P2 therefore both are false. Since 1 or more than 1 premise is false, the conclusion will always be false. A guy argues that it is a valid argument. On the other hand, I say it is not a valid argument. I don't know which informal fallacy it is. Does this argument contain really a fallacy or the other guy is right ?