BrainDen.com - Brain Teasers
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## Question

I used to present this logic puzzle to students and co-workers.

Fact 1: 50% of traffic accidents that result in injuries and deaths are caused by a drunk driver.

Fact 2: Traffic injuries and deaths are bad.

What is the third fact that is needed to reach the conclusion?

This is a logic puzzle, I do not know the current statistics on drunk driving. They are not relevant to the solution.

Edit: I'm sorry, I seem to have put this in the wrong category. I don't see a way to move it.

Edited by Scott from Eagan

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So where's the flaw in

Since only 50% of the accidents were caused by drunk drivers, wouldn't we need to know that all of the accidents caused by sober drivers would also have been caused had the driver been drunk?

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Since only 50% of the accidents were caused by drunk drivers, wouldn't we need to know that all of the accidents caused by sober drivers would also have been caused had the driver been drunk?

Noted. Driving drunk might have caused Sober-Accident group to not have accidents.

I value your lessons in proofs, Mo.

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Noted. Driving drunk might have caused Sober-Accident group to not have accidents.

I value your lessons in proofs, Mo.

Lesson 361 - Do not confuse common sense with logic

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