Statement: He is a published author. Conclusions: I. He has written a book. II. His book is a bestseller. MCQ with Answer and Explanation

Explanation:
When there are two negative statements, no definitive positive or negative relationship can be established between the subject of the first and the predicate of the second (cat and rat). Since I and II form a complementary pair covering all possibilities, either I or II must be true.

Explanation:
I is a speculation; cause unknown. II directly follows from 'not working'.

Explanation:
Fully booked means no tables available, so I follows. Popularity cannot be deduced; it could be a small place. So II does not follow.