S2 L3 Validity

Which argument is valid?

• All cats are cute and Tiddles is cute so Tiddles is a cat.

• All cats are cute and Tiddles is furry so Tiddles is a cat

• All cats are cute and Tiddles is a cat so Tiddles is cute

Which argument is valid?

• If it is Saturday then i'm playing hockey . Its Saturday, so Im playing hockey

• If its Sunday then i'm going to church and i'm in church so it must be Sunday

• If it is Friday then i'm going swimming and i'm swimming so its Friday

Which is valid?

• All planets are made of chocolate, i'm made of chocolate so I am a planet.

• All planets are called Pluto, Tim is a planet so he is called Pluto

• All planets have rings, Saturn has a ring, so Saturn is a planet

Which is valid?

• All birds lay eggs, crocodiles lay eggs so crocodiles are a bird.

• All reptiles are cold blooded; snakes are cold blooded so snakes are reptiles

• All mammals are warm blooded, giraffes are mammals so giraffes are warm blooded.

Which is valid?

• All birds have wings, parrots have wings so parrots are birds

• Birds can fly, penguins are birds so penguins can fly

• All flies have wings, bluebottles are flies so bluebottles have wings

Which is valid?

• If i'm in bed then I am sleeping and i'm in bed so I must be sleeping

• If i'm awake then it is day time, it is day time so I must be awake

• If I am dreaming I must be asleep and i'm asleep so I must be dreaming

Which is valid?

• Cows cause greenhouse gases, vehicles cause greenhouse gases so cows are vehicles

• If hens lay eggs then monkeys eat bananas, hens do lay eggs so monkeys must eat bananas

• If dogs are poodles then dogs are mammals but dogs aren't poodles so dogs cant be mammals.

which is valid?

• if x then y, not x so not y

• If x then y, x then y

• If x then y, y therefore x

Which is valid?

• All snails have shells, Jim has a shell so jim is a snail

• All crabs have claws and lobsters have claws so lobsters are crabs

• All prawns have a shell and Stephanie is a prawn so she has a shell

Which is valid?

• All dragons breathe fire and Excalabor breathes fire so Excalabor is a dragon.

• All wizzards attend hogwarts and Harry attended Hogwarts so harry is a wizzard.

• All Slytherin pupils turn out evil, Voldermort was in Slytherin so Voldermort is evil.