johnnyboy41706
johnnyboy41706
18.03.2020 • 
Mathematics

Omar got a train ticket valid for the nine cities listed below. He can choose to visit some, none, or all of these cities. Amsterdam, Brussels, Cologne, Dortmund, Duisburg, Lille, Paris, Rotterdam, Utrecht In how many different ways can Omar choose the cities to visit? (The order of the cities chosen doesn't matter.)

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