Re: jnu doubts

Posted by jess on May 18, 2013; 4:37am
URL: http://discussion-forum.276.s1.nabble.com/jnu-doubts-tp7580858p7580972.html

I dont think its 3/5. It should be 1/2 instead.

Here, DS cant be possible as even if they have say 1st daughter, they immediately have a son after that. So it ends reproduction. And of course, if they already have a son, it makes no difference.

So i should have total possible 8 children in the 1st period:

1D, 2D, 1D1S, 2S, 1S = 8 children (i)

Out of there, 4 are D's and thus probability is 4/8

In period 2,

for 2D and 1D, reproduction happens again and for each node, the same previous (i) is repeated. Thus there are 16 cases now and 8 D's. So 8/16

This keeps happening and probability for each repeated periods is 1/2

(Just a guess. Correct me if i am wrong :) )