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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 :  

  • A.nscd
  • B.ndsc
  • C.csdn
  • D.dncs

Answer: B

Correct answer: ndsc

Test the order novel, drama, story, comic repeated through the pile. Each novel has a drama immediately below it, satisfying the first rule. Each story-book has a comic immediately below it, satisfying the second. And no story-book touches a novel, since the drama above it and the comic below it keep them apart - the comic separating each story-book from the novel that begins the next group of four.

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