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The survey of 36 students in a class pertaining to reading habits of three types of books; Novels (N), Fiction (F) and Comics (C) revealed the following information:
12 students read N
15 read F
12 read C
3 read both N and C
5 read both N and F
4 read both F and C
And only one reads all of the three books.
Using this information, answer the questions from 52 to 55.
The number of students who do not read any of these kinds of books is
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