The members of a book group are asked whether they like fiction (F) or non-fiction (N) literature.

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The members of a book group are asked whether they like fiction (F) or non-fiction (N) literature. The results are shown in the Venn diagram.

a. 20 people like fiction and 17 like non-fiction. One member says that therefore there must be 37 people in the book group. Explain whether this is correct or not. Justify your answer.
b. How many members like just one of the types of literature?

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