Khan Academy Critical Thinking

You can only be accepted to a university[br]if you are human.Another necessary condition is submitting[br]an application. You can't get accepted to a university [br]unless you apply there.Philosophers sometimes put this by saying[br]that Q is true only if P is true.

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Now it's a little harder to think of a [br]sufficient condition for getting accepted to a university.

But consider some seventeen year old who[br]just won the Nobel Prize in chemistry.

"Merely taking the test isn't sufficient [br]for passing it." "The lawyer convinced the jury that there is sufficient evidence to [br]convict the accused." "Pain is a necessary part of every human[br]life." "Practice is really necessary for [br]success." But what exactly do these words mean?

If P is necessary for Q, then Q cannot be[br]true unless P is true.

But not all deductive arguments are good,[br]and so there are several things to think about when deciding whether to believe the[br]conclusion of a deductive argument.

A good deductive argument really does[br]guarantee its conclusion.

If you're behind a web filter, please make sure that the domains *.and *.are unblocked. I'm Jeff Pynn, and I teach philosophy[br]at Northern Illinois University.

In my earlier Introduction to Critical[br]Thinking video, I described the difference between deductive arguments and ampliative[br]arguments.

You could steer well but still drive badly[br]for other reasons.

Here is an example of a sufficient but [br]not necessary condition.