I very much agree with this. But I still think that if someone types in 2+3 at that second exercise, the program should compute it properly and not error out :)
It's a neat idea, but it sounds like what you're proposing is a subset of marketing automation, which has not been mentioned almost at all in this post.
I would recommend doing a bit more research about what marketing people are already using, what other products your product may interact with yours, and how it would fit in the arsenal of marketing tools.
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