In this type of questions, some clues regarding seating or placing sequence (linear or circular) of some persons or items is given. The candidate is required to form the proper sequence using these clues and answer the questions accordingly.
In a pile of reading material, there are novels, story-books, dramas and comics.
Every novel has a drama next to it, every story-book has a comic next to it and there is no story-book next to novel.
If there be a novel at the top and the number of books be 40, the order of the books in the pile is :
Clearly the sequence is :
novel, drama, story-book, comic i.e. ndsc