perplexus.info :: Probability : Simple coins

Simple coins (Posted on 2002-04-09)

I toss two coins and look at the outcome. I then tell you that at least one of the coins is showing up as "tails". What is the chance that the other one is showing "tails" as well?

(from techInterview.org)

See The Solution Submitted by art

Rating: 3.8750 (16 votes)

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I think that...

| Comment 12 of 45 |

Its a 50% chance that the second will say 'tails' as well. The fact that the first one said tails doesn't affect the probability of the second one.

Posted by Lewis on 2003-05-04 06:47:22

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