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?

Sorry for one mistake in text of my solution - 10 possibilities of initial 26 include three deaths, so in these ten cases the 6th fly will definitely escape. But the result is correct.

Posted by Saso on 2003-11-25 09:23:40