Estimate the probability that in a room of volume V, all the N molecules of air are found in volume \frac{3V}{4} and none at all in the reaining volume V/4
My take to the solution is
Pr of finding N molecules in \frac{3V}{4} : \frac{N}{3V/4}= \frac{4N}{3V}
Pr finding none in V/4...