Question 1
What's the correct obverse of "All scholarly books are best sellers"?
◦ No scholarly books are best sellers.
◦ No scholarly books are non-best sellers.
◦ Some best sellers are scholarly books.
Question 2
What's the correct obverse of "No space telescope is a school lab"?
◦ All space telescopes are non-school labs.
◦ No space telescope is a non-school lab.
◦ Some space telescopes are non-school labs.