Answer:
Step-by-step explanation:
I bought 12 pounds of coffee. I used 1/4 of the coffee in a week. How many pounds did i used in a week??
As we observe clearly the problem given, it is clear that the order in which Debbie would choose the 3 books out of the total of 45 books is not important. This makes the problem an example of a Combination problem. The answer to this item is therefore letter B. C(45,3) read as <em>combination of 45 taken 3</em>.
Step-by-step explanation:

So there's no answer, because D must be equal or more than 0.