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On all the city's public transport you can buy a single ticket every time you ride (145 ptas), but even over only a couple of days it's cheaper to buy one of the available targetes -ticket strips which you either pass through the box on top of the barrier or punch in the machine at the metro entrance or on the bus. These tickets can be used by more than one person at a time- just make sure you punch it the same number of times as there are people travelling
Single tickets are quite expensive (NOK 18). However, important reductions are available with different cards for one day, one week or a month or a coupon for 8 trips (NOK 105). Weekly and monthly cards are ˝ price if you are under 20 years of age. You may buy all these cards at Trafikanten, at the main metro stations (Nationaltheatret and Majorstua) and at Oslo Central Station.