The Jansen family drove a total of 240 miles on their road trip. This distance is 5 times the distance they drove on the first d
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The number of ways of choosing 4 digits from 10 digits without replacement ( order is important) is . This is the number of all possible permutations of choosing 4 from 10. The first 4 numbers of your phone number is a unique 4 digit number(4 different digits). The required probability is