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duolingo abc Its solutions include The Duolingo Language Learning App, Super Duolingo, Duolingo English Test: AI-Driven Language Assessment, Duolingo For Schools, Duolingo ABC, and Duolingo Math. It has three predominant sources of revenue; time-based subscriptions, in-app advertising placement by third parties, and the Duolingo English Test
duolingo tiếng anh Duolingo, Inc., b is an American educational technology company that produces learning apps and provides language certification. Duolingo offers courses on 43 languages, 5 ranging from English, French, and Spanish to less commonly studied languages such as Welsh, Irish, and Navajo, and even fictional languages such as Klingon. 6
