Question

There are 20 books on the summer reading list. In how many different ways can you choose one per week for six weeks?
120
21,400
10,350,200
27,907,200

Answer 1

There are 20 books for the first week

19 for the second

18 for the third

etc

all the way til you get to 15 for the sixth week.


So there are 20*19*18*17*16*15 = 27,907,200 different ways