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hmate9
on June 10, 2015
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Duolingo Raises $45M, Now Valued at $470M
They provide official language exams right on your mobile device for $20.
Someone1234
on June 10, 2015
[–]
What does "official language exams" mean?
Consider applying for YC's Fall 2025 batch! Applications are open till Aug 4
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