Let's look at our four cards again:

... and ask which ones do we turn over to find out if the statement:

If you're out of Schlitz, then you're out of beer.

... is TRUE?

And here is one "common sense"response that an intelligent individual can give:

Card 1:

Well, if you're out of beer, you have to check which type of beer you are out of. So we have to turn this card over.

Card 2:

You had Bud so you can't be out of Schlitz. So you don't have to turn this card over.

Card 3:

You have some beer left over. So it doesn't matter. So you don't need to turn this card over.

Card 4:

You bought Schlitz. So you might be out. So you do have to turn this card over.

So we have to turn over Cards #1 and #3.

Alas, despite the wisdom normally exercised by intelligent individuals, this answer isn't correct. So to see the correct answer, just click here.

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