[lch]

Yeah, my bad about the zero/one/two/three/four being equally possible. That was simplifying it too much, although I wouldn't want to do this in a full detail analysis which would include at which level you searched for the sites already, what terrain we have, etc. - this can get overly complicated.

What's only important: How many sites there are (a random variable), how many sites we found already and how much we searched already / how many search possibilities are left.