There are 20 books on the summer reading list. in how many different ways can you choose one per week for six weeks?

There are 20 choices for the first week, 19 for the second week, 18 for the third, 17 for the fourth, 16 for the fifth and 15 for the sixth week, giving a total number of ways of choosing as follows:

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.