In questions numbered 1 to 20. a questionis followed by data in the form of two statements labeled as Iand II. You must decide whetherthe data given in the statements are sufficient to answer the questions. Using the data make an appropriate choice from (1) to (4) as per the following guidelines:

Question 9

For two sets A and B, what is $$n(A \cap B)$$?
I. $$n(A) = 10$$ and $$n(B - A) = 9$$
II. $$n(A - B) = 7, n(B - A) = 9$$ and $$n(A \cup B) = 19$$

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