Valid or Invalid? - The Syllogisms

Syllogism 1 of 15

Remember, we're interested only in whether the argument is valid; that is, whether the conclusion follows as a matter of necessity given the truth of the premises. Just select "Valid" or "Invalid" from the drop-down list below, then press Next.

Please select... Valid Invalid

Really Deep Thought

The fundamentalists, by 'knowing' the answers before they start, and then forcing nature into the straitjacket of their discredited preconceptions, lie outside the domain of science - or of any honest intellectual inquiry.
   --Stephen Jay Gould.