1.2ex V Valid
Arguments
Drag the description (in red)
to the appropriate argument below. (Place
them at the top left
of the argument -- they will "snap" into place over the white space.)
Start.
Good! Notice that one can't tell that an argument is valid from the
truth or falsity of premises and conclusion.
Back to chapter one...
All
ravens are birds.
No birds are mammals.
_____________
No ravens are mammals.
Some
monkeys are human.
All humans have tails.
_____________
Some monkeys have tails.
All
whales are fish.
All fish fly.
_______
All whales fly.
Valid,
True Premises,
False Conclusion
Valid,
True Premises,
True Conclusion
Valid,
False Premises,
False Conclusion
Valid,
False Premises,
True Conclusion
Invalid,
True Premises,
False Conclusion