If you want to learn a new language, chances are you'll come across Duolingo's(NASDAQ: DUOL) app. In this Sept. 9 video from the YouTube channel of Motley Fool contributors Brian Stoffel and Brian Feroldi, find out about the three revenue streams this company has developed, and see how the company scores on each of their investment frameworks. Brian Feroldi: Is Duolingo a good investment?
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