Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
This post is all correct except for the last paragraph. This property you describe is true in general, but this problem is a simpler case. It's trivial to show that E[G]/E[G+B] = 1/2 if G and B are i.i.d variables... E[G]/E[G+B] => 1/(E[G+B]/E[G]) => 1/(E[G]/E[G]+E[B]/E[G]) => 1/(1+1) => 1/2`
