A sound argument is a valid deductive argument with true premises.

A deductive argument cannot be both valid and unsound.

All valid deductive arguments are sound arguments.

A deductive argument can be either valid or invalid and still have true premises.

When the conclusion of a deductive argument is true, the argument must be sound.

When the premises of a deductive argument are true, the conclusion is always true as well.

If a deductive argument is sound, then the conclusion must be true.

A deductive argument could have a false premise and still be sound.

In a valid deductive argument the conclusion could be true or false.

An invalid deductive argument could have all true statements in it.

Evlauate the following argument: Either President Lincoln was assassinated, or he was killed in an accident. President Lincoln was not killed in an accident. Therefore, President Lincoln must have been assassinated.

Either Princess Diana was assassinated, or she was killed in an accident. Princess Diana was not killed in an accident. So Princess Diana must have been assassinated.

It is December. December is in the wintertime. So it must be winter.

It is December. December is in the wintertime. So it must be snowing.

Which of the following premises makes this argument valid? Barbara earned a 3.5 GPA in her first semester. Barbara is a good student.

Which of the following premises makes this argument valid? Young's daughters went shopping on Saturday. Therefore, Young has no money now.

Which of the following premises makes this argument valid? Andrew made the U.S. Olympic team. He must be a good athlete.

Which of the following premises makes this argument valid? Premise: Max barks. Conclusion: Therefore, Max is a dog.

Which of the following premises makes this argument valid? Matthew Sampson is an ultra -liberal in his political views. He doen't have a chance of being elected governor of this state.

Which of the following premises makes this argument valid? Fido is barking. Someone must be in the front yard.

Evaluate the following argument: All whales can fly Anything that is able to fly can shoot lasers with their mind All whales can shoot lasers with their minds

Evaluate the following argument: My girlfriend’s dog is a rabbit All rabbits are named Butch My girlfriend’s dog is named Butch

Evaluate the following argument: Some birds are cockatiels All cockatiels are birds Therefore, all birds are cockatiels

Evaluate the following argument: All monkeys are primates All primates are mammals All monkeys are mammals

Evaluate the following argument: All dogs are mammals. All dogs have hearts. Therefore, all mammals have hearts.