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)

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Puzzle Solution	K Sengupta	2009-02-26 15:34:03
Answer	K Sengupta	2009-02-15 15:36:15
re(3): simpler computation	SilverKnight	2003-12-04 16:55:15
re(2): simpler computation	Bob Genisot	2003-12-04 16:31:08
re: Easier than it sounds...	Lee	2003-12-03 23:57:12
Easier than it sounds...	Magick321	2003-12-03 22:53:38
Solution?	Prab	2003-11-28 00:30:00
spider and fly	Ed Lunn	2003-11-26 18:19:49
none	Lee	2003-11-26 13:53:19
Solution	Clinton Heath	2003-11-26 12:24:57
re: Solution to a strange question	krdmt5_000	2003-11-25 16:23:48
Solution to a strange question	krdmt5_000	2003-11-25 16:18:30
re(3): simpler computation	Robin Gatter	2003-11-25 12:13:45
re(2): simpler computation	Charlie	2003-11-25 10:36:38
re: simpler computation	SilverKnight	2003-11-25 10:10:59
simpler computation	Charlie	2003-11-25 09:58:41
re: just a little correction in my text	SilverKnight	2003-11-25 09:46:00
well, I was wrong - corrected solution	Saso	2003-11-25 09:45:18
just a little correction in my text	Saso	2003-11-25 09:23:40
solution	SilverKnight	2003-11-25 09:19:08
solution	Saso	2003-11-25 09:18:32

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