i'm gonna go with 0.6 vs 0.4 for the random walk. for the brownian , how do you define the motion ? pick a side at random, and then move a distance taken from 1/f ?

<t>well, if p=0.5 the problem is a lot simpler. if you pair the moves (since it will never be an odd number) you can reduce the problem down to being at point C or AHeads, you go to A ,(or stay, if it is the first)tails - go to C . (or stay)how many times do you have to through a coin until you see ...

Cool so the original number of girls in the room does not matter at all. it cancels out. so if you originally had 0 girls or 1miliion girls doesn't matter.

<t>matlab code. split the last vertex into 2, stochastic matrixN=3; % 3 is for triangle, it actually creates 4 vertices, another termination pointstoc=diag(.5*ones(1,N),-1)+... diag(.5*ones(1,N),1);stoc(:,1)=[1;zeros(N,1)];stoc(:,end)=[zeros(N,1);1];startvertex=[0;1;zeros(N-1,1)];final_distribution=...

MATLAB does have it built in look up "rdivide"the logic is that if y=x*b +errorb(minimum (least square) error) b= x\y(y, x are in columns , the first row is the first observation, t=1, so the dimensions are y(MxN) , x(MxK) , and B(KxN))