I like this solution best because it does something honestly new and unusual.

However there is one caveat. While it does indeed avoid reading the file into memory, and the actual questions chosen are randomized, the first 10 questions in the list will always appear "in position" if they appear. For perfectly random questions, therefore, it would be best to throw in a shuffle at the end.

In reply to Re (tilly) 2 (unrandomness): Extract random records from text file by tilly
in thread Extract random records from text file by SuperCruncher

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