When did ABBA have their first hit?

Related questions

1. Is anyone from Abba dead?
2. What is the meaning of Voulez vous?
3. Are the members of ABBA still married to each other?
4. Are any of ABBA dead?
5. Is Abba going to perform again?
6. Is it true ABBA are getting back together?
7. Who married Susan Boyle?
8. Which ABBA song sold the most?
9. Is Abba ever getting back together?
10. What happened with ABBA members?

Tags

1. #winning
2. #sweden
3. #credited
4. #performing
5. #eurovision
6. #single
7. #under
8. #group
9. #april
10. #first
11. #began
12. #worldwide
13. #victory
14. #entry
15. #contest