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March 30, 2015

Homework Help: math

Posted by anonymous on Monday, July 1, 2013 at 12:53pm.

A newly-opened restaurant has 5 menu items. If the first 4 customers each choose one menu item uniformly at random, the probability that the 4th customer orders a previously unordered item is a/b, where a and b are relatively prime positive integers. What is a+b?

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