## Prime NineProbability puzzles require you to weigh all the possibilities and pick the most likely outcome.There are 9! ways to arrange the digits 1-9 to form a 9-digit number.
E.g. 345, 987, 126 If you know this, then if I wrote all 9! possibilities on cards (1 way per card), and I asked you to select one at random; what is the probability that the number you selected is prime? ## What Next?
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