
SE MN  What makes you think that you know the population you are planting. Did you count every plant on every acre? Both numbers are based on estimates and extrapolations. By considering how precise the small scale estimate is and how the estimates compare, you can use statistics to determine the likelihood that one number is bigger than the other. In this case, the likelihood that the number of stars is larger than the number of grains of sand is high enough that it isn't worth worrying about the obverse. If you don't like probability, take it up with quantum mechanics.
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