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: ( Back to comment list | You must be logged in to post comments.)

re: just a little correction in my text

| Comment 5 of 21 |

(In reply to just a little correction in my text by Saso)

Saso, I believe you made a mistake in your calculation... 26 cases does NOT mean 26 equally likely cases.... and you interpreted them as equally likely.

--- SK

Posted by SilverKnight on 2003-11-25 09:46:00

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