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Poll 2-1 has a typo where the third option should say seq(from= ...) and not seq(from- ...)
Maybe the demo should not introduce tidyverse and we should use indexing to choose rows. Students don't know what tidyverse is and haven't installed it so they may be quite confused seeing it out of the blue!
For (2) I've added a line to install tidyverse - b/c this is a demo for the instructor I'll keep the reference to tidyverse for now but can consider your change in the future if its not working out. Thanks!