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A student finds 7 books of his interest but can borrow only three books. He wants to borrow the Chemistry part II book only if Chemistry Part I can also be borrowed. Find the number of ways he can choose three books that he wants to borrow.

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There are 7 books of student’s interest, but he can borrow only three books. He wants to borrow the Chemistry part II book only if Chemistry Part I can also be borrowed.

Consider the following table:

Required number of selections = 5 + 10 = 15

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