Mathematics, 18.03.2021 01:40 hannahkharel2

Heather got a train ticket valid for the eight cities listed below. She can choose to visit some or all of these cities. She must visit at least one of them. Amsterdam, Brussels, Cologne, Duisburg, Lille, Paris, Rotterdam, Utrecht
In how many different ways can Heather choose the cities to visit? (The order of the cities chosen doesn't matter.)

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