Is the following sentences a valid or invalid syllogism.

Major premise: If he gets the flu, he will die. Minor premise: He got the flu. Conclusion: Therefore, he will die.

If he has the flu, he will die. He will die. Therefore, he has the flu.

No out-of-state students are taxpayers. Some freshmen are out-of-state students. Therefore, some freshmen are taxpayers.

Andrew Reynolds wears Emerica skate shoes. Andrew Reynolds is a really good skateboarder. You should wear Emerica skate shoes so you can be a really good skateboarder.

All Catholics are Protestants. All Protestants are Baptists. Therefore, all Catholics are Baptists.

All horse-race betting is gambling. Some gambling is illegal. Therefore, some horse-race betting is illegal.

Racist slurs directed against innocent people are offensive and ought to be punished. John stood on the commons and shouted racist epithets at people who happened to pass by. John engaged in offensive behavior and ought to be punished.

Those who get good grades study diligently. All students are anxious to get good grades. Therefore, all students study diligently.

Anything I possess is mine. I possess your pen. Therefore, your pen is mine.

All brilligs are slithy toves. No slithy toves are borogroves. Therefore, no borogroves are brilligs.

All typhoons are destructive windstorms. All cyclones are destructive windstorms. Therefore, all cyclones are typhoons.

Since robins are two-legged creatures and since all birds are two-legged creatures, it follows that all robins are birds.