18. A boy has 3 library tickets and 8 books of his interest in the lib

1.	18. A boy has 3 library tickets and 8 books of his interest in the library, Of themse &bedoes not want to borrow Chemistry part II, unless Chemistry part I is also becmowedIn how many ways can he choose the three books to be borrowed ?
Answer» The first option is he chooses any of the books other then chemistry part 2 = 7C3 = 35 The second option is he selects both the chemistry books and any other book from the remaining options = (2C2 * 6C1) = 6 So he can choose in a total of 41 ways.

18. A boy has 3 library tickets and 8 books of his interest in the library, Of themse &bedoes not want to borrow Chemistry part II, unless Chemistry part I is also becmowedIn how many ways can he choose the three books to be borrowed ?

Answer»

The first option is he chooses any of the books other then chemistry part 2 = 7C3 = 35

The second option is he selects both the chemistry books and any other book from the remaining options = (2C2 * 6C1) = 6

So he can choose in a total of 41 ways.