Set Theoryhard
0:00.0
In a library of 100 books, 40 are novels, 35 are textbooks, and 30 are biographies. It is known that 15 are both novels and textbooks, 10 are both textbooks and biographies, and 12 are both novels and biographies. If every book falls into at least one of these three categories, how many books are exclusively novels?
In a library of 100 books, 40 are novels, 35 are textbooks, and 30 are biographies. It is known that 15 are both novels and textbooks, 10 are both textbooks and biographies, and 12 are both novels and biographies. If every book falls into at least one of these three categories, how many books are exclusively novels?