That means it is a statistical certainty that there is at least one planet somewhere that has at least one farm animal because:
p = 1 -
Simple mathematics tells us that the population of the Universe must be zero. Why? Well given that the volume of the universe is infinite there must be an infinite number of worlds. But not all of them are populated; therefore only a finite number are. Any finite number divided by infinity is as close to zero as makes no odds, therefore we can round the average population of the Universe to zero, and so the total population must be zero.
Thank you Douglas Adams:-)