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?

- math -
**yong**, Tuesday, July 2, 2013 at 6:08am
189

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