perplexus.info :: Probability : Spider and Fly

Spider and Fly (Posted on 2003-11-25)

A spider eats 3 flies a day. Until the spider fills his quota a fly has a 50% chance of survival if he attempts to pass the web.

Assuming 5 flies have already made the attempt to pass, what is the probability that the 6th fly will survive the attempt?

See The Solution Submitted by Ravi Raja

Rating: 3.6250 (8 votes)

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Solution to a strange question

| Comment 10 of 21 |

The 6th fly has a 50% of Survival like the other 5 flies that pass through. the answer is right there in the question...idiots

Posted by krdmt5_000 on 2003-11-25 16:18:30

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