Much more than 3 European countries have not adopted the Euro. But I assume you mean which EU countries have not adopted the Euro:
Sweden
Bulgaria
Romania
Latvia
Hungary
Poland
Denmark
It is easier to name which countries use the Euro, as there are less who use the currency than who do not. The countries of Ireland, Portugal, Spain, France, Malta, Italy, Belgium, Luxembourg, the Netherlands, Germany, Finland, Estonia, Austria, Slovakia, Slovenia, Greece, and Cyprus all use the Euro. The Euro is also unofficially used in Kosovo, Montenegro, Andorra, and Zimbabwe.
There are about 50 countries in Europe. 27 of those are members of an organisation known as the European Union. 16 of those 27 use the Euro as their currency. So well over 30 countries in Europe do not use the Euro. Your question refers to Sweden, Denmark and Britain. At the time the Euro was introduced, in 2002, there were 15 countries in the European Union. 12 of those started using the Euro, but those 3 did not.
All members of the European Union are obliged to adopt the Euro once possible, with the exception of Denmark and the United Kingdom, who both obtained legal opt-outs. Sweden, who has a de facto opt-out, is obliged to adopt the Euro but clearly does not wish to. Swedes voted against the Euro in a 2003 referendum, which is still considered valid. Sweden has made no plans to adopt the Euro in the near future, and currently has not met the criteria needed to do so. Once this is met, however, they are obliged to adopt the currency under EU regulations.
So the three countries you're most likely looking for are Denmark, Sweden, and the United Kingdom.
Europe does not have one single currency. The most widely used currency is the Euro, which is the official currency in 18 countries of the European Union. The other 10 countries in the European Union do not use the Euro. Not all of Europe's countries are in the European Union but some of the European countries outside the European Union use the Euro. The majority of countries in Europe do not use the Euro.
17 of the 27 members of the European Union use the Euro as their currency.17 of the 27 members of the European Union use the Euro as their currency.17 of the 27 members of the European Union use the Euro as their currency.17 of the 27 members of the European Union use the Euro as their currency.17 of the 27 members of the European Union use the Euro as their currency.17 of the 27 members of the European Union use the Euro as their currency.17 of the 27 members of the European Union use the Euro as their currency.17 of the 27 members of the European Union use the Euro as their currency.17 of the 27 members of the European Union use the Euro as their currency.17 of the 27 members of the European Union use the Euro as their currency.17 of the 27 members of the European Union use the Euro as their currency.
No African countries use the euro.
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The currency used is the same one as most of the European Union countries: The EURO!
St. Martens
No currency is the currency for most European countries. There are over 50 countries in Europe. 18 of them use the Euro, but most use other currencies. So the Euro is the most common currency, but it is not used by most European countries.
The Benelux countries are all members of the European Union and use the Euro as their currency.
The currency is called the Euro, not the Euro Dollar. Not all countries in the European Union use the Euro. There are 28 countries that are members of the European Union. 18 use the Euro. 10 use their own currencies.
The single currency was the Euro.
Some countries do not use the Euro because they have their own currency and do not wish to change, or at least not for a while.
No. Only 19 of the 28 member countries use the Euro. The other 9 use their own currency.