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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spider and fly

| Comment 14 of 21 |

Solution : 3 out of 4

Posted by Ed Lunn on 2003-11-26 18:19:49

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