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I can't select the answer of a function question

I can't select the answer of a function questionin the function and modules. So I used a hint to unlock it but it didn't even work. Don't know what to do to skip it to reach next lessons.

24th Aug 2019, 8:00 AM
Raphaël
1 Answer
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restart app
3rd Oct 2019, 6:11 AM
Matthew Li
Matthew Li - avatar