Y9 Computing: Syllogisms

All cats are mammals.

Some dogs are mammals.

Therefore: some dogs are cats.

• TRUE

• FALSE

All humans are mortal.

Socrates is human.

Therefore, Socrates is mortal.

• TRUE

• FALSE

No birds are fish.

Penguins are birds.

Therefore, penguins are not fish

• TRUE

• FALSE

Some athletes are runners.

All runners are fast.

Therefore, some athletes are fast.

• TRUE

• FALSE

All dogs have four legs.

Fido is a dog.

Therefore, Fido has four legs.

• TRUE

• FALSE

All cats are animals

Fluffy is a cat

Therefore.......

All fruit grows on trees

Apples are fruits

Therefore......

All cars need fuel

The red car is a car

Which of the following conclusions is valid?

• The red car needs fuel

• The red car does not need fuel

• The blue car needs fuel

• No cars need fuel