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Suppose 5 different integers are randomly chosen from between 20 and 69, inclusive. What is the probability that they each have a different tens digit?

 Feb 3, 2019

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50/50   x   40/49  x  30/48  x 20/47  x 10/46      ??? 

 Feb 4, 2019
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50/50   x   40/49  x  30/48  x 20/47  x 10/46      ??? 

ElectricPavlov Feb 4, 2019

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