Solve the problem.Ron finds 9 books at a bookstore that he would like to buy, but he can afford only 4 of them. In how many ways can he select 4 of the books to buy? How many ways can he make his selection if he decides that one of the books is a must?
A. 126; 56
B. 3024; 336
C. 1512; 168
D. 15,120; 6720
Answer: A
Mathematics
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